Get Your Boss RC-20XL Manual | PDF Guide & Tips


Get Your Boss RC-20XL Manual | PDF Guide & Tips

The document in question provides detailed instructions and specifications for operating a specific audio looping device. It serves as a primary resource for understanding the unit’s features, functions, and troubleshooting procedures. A typical instance might include sections on setup, recording, playback, effects, and advanced settings unique to the device.

The value of such a guide lies in maximizing the user’s ability to effectively utilize the hardware’s capabilities. It allows individuals, regardless of their technical proficiency, to unlock the full potential of the equipment. Historically, these guides have evolved from simple paper pamphlets to comprehensive digital resources, reflecting the increasing complexity of electronic music instruments and the need for clear, accessible information.

The following sections will delve into specific aspects of this crucial resource, covering topics such as its structure, content organization, troubleshooting information, and its accessibility in various formats.

1. Structure

The efficacy of the documentation hinges significantly on its organization. A well-structured resource transforms from a mere collection of words into a strategic guide, allowing individuals to rapidly locate and comprehend crucial information about the device. The framework supporting it shapes user interaction and ultimately determines the device’s usage experience.

  • Table of Contents

    The initial gateway presents a hierarchical overview, outlining major sections and subsections. Its presence significantly expedites information retrieval, allowing users to jump directly to relevant areas, such as “Effects Parameters” or “MIDI Implementation.” A comprehensive table of contents mitigates the need to sift through the entire manual, improving efficiency in addressing specific queries.

  • Chapter Divisions

    Content is logically segmented into chapters, each addressing a specific function or feature. For instance, a dedicated chapter on “Recording Techniques” might detail various recording modes, overdubbing procedures, and loop quantization settings. This modular design enables targeted learning and problem-solving, preventing information overload and fostering a structured understanding of the device’s functionalities.

  • Index

    An alphabetical listing of key terms and concepts directs users to specific page numbers where these topics are discussed. The index serves as a powerful search tool, allowing rapid location of information even without prior knowledge of the document’s overall structure. For example, searching “Tempo Synchronization” in the index will lead directly to sections explaining external clocking and beat matching functionalities.

  • Appendix

    Supplemental information, such as MIDI implementation charts, troubleshooting guides, or a glossary of terms, resides in the appendix. These additions enrich the document by providing readily accessible support material. The inclusion of a detailed MIDI CC chart, for example, empowers advanced users to control the device remotely via external controllers or software, significantly expanding its creative potential.

Ultimately, the architectural design of the document dictates its usability. A logical, well-organized framework enhances the user’s ability to navigate, comprehend, and apply the information, transforming the document from a simple reference into a powerful tool for unlocking the device’s full potential.

2. Navigation

Effective use of the documentation relies heavily on intuitive navigation. Without it, valuable information remains buried, rendering the resource ineffective. Consider the document as a map: its design and clarity determine whether the user reaches their intended destination, understanding the device’s functionality in the process.

  • Hyperlinking and Internal References

    The presence of hyperlinks enables immediate jumps between related sections within the document. Imagine a section describing “Loop Quantization.” A hyperlink would connect it directly to the “Tempo Settings” section, clarifying the interdependent relationship. This web of interconnected information streamlines the learning process and reduces the frustration of searching for associated topics. The absence of such linking leaves users stranded, forcing manual searches and hindering comprehension.

  • Search Functionality

    In digital versions, a robust search tool acts as a compass, guiding users to specific terms or phrases throughout the entire resource. Should one encounter an unfamiliar setting, such as “Reverse Playback,” a quick search immediately reveals relevant explanations, examples, and potential applications. A deficient search function, by contrast, results in a frustrating experience, akin to searching a physical library without a catalog. Without this, the resource’s depth becomes a liability, as the user struggles to locate the information they seek.

  • Visual Cues and Formatting

    Clear headings, subheadings, and consistent formatting guide the eye and facilitate comprehension. Bolding important terms, using bullet points for lists, and incorporating diagrams break up monotony and aid in information retention. A document lacking visual organization quickly becomes overwhelming, resembling an unorganized collection of notes rather than a structured guide. The presence of such visual markers significantly improves the speed and efficiency with which users can extract relevant data.

  • Interactive Elements

    Advanced versions might incorporate interactive diagrams or simulations, allowing users to virtually manipulate device settings and observe their effects. This hands-on approach transforms the learning process from passive reading to active experimentation. A button that plays a sample audio clip demonstrating “Stutter Effect,” would illustrate the parameter in action, enhancing comprehension through auditory feedback. The absence of these dynamic components limits the user’s ability to explore the device’s capabilities in a meaningful and engaging manner.

Ultimately, the navigational elements dictate the user’s interaction with the documentation. A resource with strong navigational features transforms into a powerful learning tool, empowering users to quickly access and understand the device’s complex functionalities. Conversely, a poorly designed navigation system hinders the entire user experience, burying valuable information and frustrating users in the process.

3. Troubleshooting

The section dedicated to resolving operational anomalies within the device is of utmost importance. It serves as a lifeline when the creative flow is interrupted by unexpected malfunctions. Consider a scenario: A performer, mid-performance, encounters a sudden cessation of loop playback. Panic ensues. However, the presence of a comprehensive troubleshooting guide offers a pathway to resolution. The manual, if well-constructed, will list potential causes for such an event power supply issues, incorrect pedal assignments, or corrupt memory and offer step-by-step procedures to diagnose and rectify the problem. The absence of such guidance forces the performer into a state of helplessness, potentially leading to performance failure and lost opportunities.

This segment of the documentation provides detailed analyses of common issues. It goes beyond simply listing symptoms; it explores potential root causes. For instance, if the device exhibits a “clicking” sound during looping, the guide might explain that this could stem from improper gain staging or conflicts with other connected devices. It would then offer methods for adjusting input levels, checking cable connections, and isolating potential interference sources. This detailed analysis transforms a vague symptom into a manageable problem, empowering users to systematically eliminate potential causes until the issue is resolved. A real-world example may be solving power connectivity issues by following specific diagnostic steps within the manual, such as testing different power outlets or power adapters.

Ultimately, the troubleshooting section is not merely a list of fixes; it is a vital component of the user experience. It fosters self-reliance, reduces reliance on external support, and, most importantly, prevents technical difficulties from stifling creative expression. Without a robust and well-organized troubleshooting guide, the potential of the device remains constrained, limited by the user’s fear of encountering insurmountable problems. The understanding and application of this segment within the full set of documentation serves as an invaluable asset.

4. Specifications

The document is incomplete without a detailed compendium of device specifications. These parameters are not mere technical jargon; they are the quantifiable boundaries within which creativity unfolds. The absence of such clarity transforms the device from a precision instrument into a black box, leaving users to operate on guesswork and intuition. A journey through these specifications is, in essence, a journey into the heart of the device itself.

  • Memory Capacity

    The quantity of storage space directly dictates the length and complexity of loops that can be recorded and stored. For a musician crafting intricate layered arrangements, the constraints of limited memory become a tangible barrier. Each overdub, each added effect, consumes precious storage, potentially truncating the final creation. Knowing this capacity, detailed within the document, allows for informed decisions about loop duration, sampling rate, and the number of available storage slots, ensuring that artistic vision is not compromised by hardware limitations. Consider a live performance where a meticulously crafted backing track is suddenly cut short due to insufficient memory. This is where the specific capacity is truly understood, but ideally, it is not where it is learned.

  • Input/Output Impedance

    This crucial specification dictates compatibility with other audio equipment. Mismatched impedance can lead to signal degradation, distortion, and even equipment damage. Understanding these values, detailed within the document, enables users to optimize signal flow, ensuring a clean and transparent sound. A guitarist, for instance, must ensure that their instrument’s output impedance aligns with the device’s input impedance to avoid signal loss or unwanted noise. The documentation provides those imperative values to avoid that. In the absence of this data, the musician risks a compromised signal chain and a diminished sonic experience.

  • Power Requirements

    Voltage, current, and polarity. These are not just numbers; they are the lifeblood of the device. Supplying the incorrect power can result in malfunction, permanent damage, or even safety hazards. The document provides this information in clear terms, eliminating ambiguity and preventing costly errors. Traveling musicians, in particular, must pay close attention to voltage requirements to avoid damaging their equipment when using different power grids. Omitting this specification is akin to removing the fuel gauge from a vehicle, leaving the operator blind to the risk of running dry.

  • Sampling Rate and Bit Depth

    These two factors define the audio fidelity of recorded loops. Higher sampling rates and bit depths capture more detail, resulting in a richer, more accurate sound. Musicians seeking professional-grade audio quality must understand these parameters to ensure that their loops meet the demands of studio recording or live performance. The manual outlines the range of available options, allowing users to tailor the settings to their specific needs. Failure to acknowledge these specifications can lead to a degradation of sound quality, rendering otherwise brilliant performances sonically inferior.

These specifications, presented within the document, are more than just data points; they are the keys to unlocking the device’s full potential. Understanding these parameters empowers musicians to make informed decisions, optimize performance, and avoid costly mistakes. Ignoring them is to operate in the dark, relying on luck rather than knowledge. In essence, these technical details transform a device from a mysterious entity into a familiar and controllable instrument, allowing creativity to flourish without the constraints of uncertainty.

5. Parameters

Within the bound pages of device operating instructions lies a world of granular control. These settings, often represented as numerical values or selectable options, dictate how the equipment interacts with its environment and shapes the sound it produces. Understanding these, as meticulously documented within its reference guide, is crucial to harnessing the device’s full potential, transforming it from a mere instrument into a dynamic extension of artistic intent.

  • Loop Length Quantization

    Imagine a live performance, the rhythmic pulse of the music demanding precise synchronization. The ability to force loop recordings to align perfectly with the beat, as defined by this setting, eliminates the risk of timing errors, ensuring seamless transitions and locked grooves. Without a firm grasp of this feature, a musician risks creating loops that drift out of sync, disrupting the flow and undermining the impact of the performance. The document provides specific instructions for setting this function, detailing the available quantization values and their effects on recorded audio, and further examples to facilitate seamless integration of looping into dynamic performance.

  • Input Gain Staging

    The delicate balance between signal level and noise floor defines the clarity and dynamics of a recording. The proper setting of input sensitivity, as outlined in the manual, prevents distortion from excessive signal levels, while simultaneously minimizing background noise from signals too weak to reach the threshold. A novice user, unaware of this crucial adjustment, may unknowingly record loops plagued by clipping or buried in hiss. The guide addresses gain staging across various input sources, including microphones, instruments, and external audio devices, providing detailed instructions for optimizing signal quality and avoiding the pitfalls of improper gain settings.

  • Effect Selection and Modulation

    Beyond simple looping, the device often incorporates effects processors, allowing for the sonic transformation of recorded material. The available effect selection, and the depth and rate of the effect parameters, as described in the guide, opens up a vast sonic palette, enabling musicians to create textures and atmospheres that transcend the original source material. Without a clear understanding of the effects parameters, as detailed in the documentation, an artist may struggle to harness the full potential of these sonic tools, limiting creative exploration and hindering the development of unique sonic signatures. The user’s guide explains the range of options, and illustrates several modulation possibilities for experimentation.

  • Tempo Adjustment and Synchronization

    The heart of looping lies in the accurate control of tempo. The capacity to precisely adjust the playback speed of loops, either manually or through external synchronization, allows the seamless integration of looped material with other instruments and digital audio workstations. The ability to control tempo and synchronization, as detailed in the documentation, facilitates the creation of complex rhythmic arrangements and the seamless layering of loops into intricate compositions. Understanding and manipulating these controls enables integration within larger music production workflows, ensuring the consistent timing in diverse settings.

These elements, are not isolated functions, but interconnected threads woven into the fabric of the device’s operation. Mastering these, through diligent study of the device documentation, empowers musicians to transcend the limitations of the hardware and fully realize their creative visions. The guide facilitates a symbiotic relationship between human and machine, where creative intent is seamlessly translated into sonic reality. The reference guide unlocks the potential within, transforming notes into a symphony of sound.

6. Diagrams

Within the realm of technical documents, a visual language often supersedes the written word. Complex electronic devices, intricate in their design and functionality, demand clarity that prose alone cannot provide. Thus, diagrams emerge as essential components, bridging the gap between abstract concepts and tangible understanding. The absence of these visual aids within the reference guide transforms a user’s experience from guided exploration to frustrating guesswork, hindering full device utilization.

  • Connection Schematics

    Consider a musician confronted with a labyrinth of cables and connectors. The diagrams presented within the document illuminate the proper pathways, guiding the user in establishing secure and functional connections. These schematics delineate the precise routing of audio signals, MIDI control data, and power supplies, ensuring seamless integration with other equipment. Imagine the frustration of a performer attempting to connect the device to a mixing console, only to encounter a cacophony of noise and distortion. Without the clarity of a connection schematic, the troubleshooting process becomes an exercise in futility, prolonging the problem and potentially damaging equipment. A detailed picture can highlight the correct placement of cables, preventing such scenarios, and facilitating a more user-friendly interface.

  • Functional Block Diagrams

    Behind the facade of knobs and buttons lies a complex network of electronic components, each performing a specific task. The diagrams offer a simplified representation of this internal architecture, revealing the flow of audio signals through various processing stages. These diagrams demystify the internal workings of the device, empowering users to understand the relationships between different functions. Consider the effect of a specific setting; tracing the signal path through a functional block diagram provides insight into its influence on the overall sound. The omission of this perspective relegates the user to blindly experimenting with parameters, lacking the crucial understanding of how they impact the device’s operation.

  • Component Layouts

    Troubleshooting malfunctions often requires a deeper understanding of the device’s internal components. The diagrams provide a visual map of the printed circuit board, pinpointing the location of specific components such as integrated circuits, capacitors, and resistors. This visual aid proves invaluable when diagnosing and repairing hardware issues, allowing technicians to quickly identify and replace faulty components. A technician attempting to troubleshoot a malfunctioning device without a component layout is akin to navigating a maze blindfolded, increasing the time and effort required to resolve the problem. These specific details can enable faster and more accurate repairs.

  • Parameter Flowcharts

    The behavior of complex digital devices is often governed by intricate algorithms and decision trees. The diagrams illustrate these processes, depicting the relationships between different settings and their impact on the device’s functionality. Consider the “auto-quantize” feature, the diagrams provide a visual representation of the algorithm that governs its behavior, illustrating how incoming audio is processed and aligned to the nearest beat. Without this visual aid, understanding the nuances of such advanced features becomes a challenging task, limiting the user’s ability to fine-tune the device to their specific needs.

Through the strategic implementation of visual aids, the reference guide transcends its role as a mere instruction manual, becoming a comprehensive tool for understanding, operating, and maintaining the device. The insights gained empower users to unlock the device’s full potential, fostering a deeper connection between human and machine. Diagrams are not mere embellishments; they are essential elements in the user’s journey towards mastery.

7. Updates

The original documentation serves as the foundation, but its relevance is inextricably linked to subsequent revisions. Time progresses, firmware evolves, and user experiences provide valuable feedback. Therefore, an examination of the relationship between these ongoing modifications and the document is essential.

  • Firmware Revisions and Feature Enhancements

    As the equipment’s internal software evolves, so too must the guide. New functions, refined algorithms, and compatibility patches necessitate revised instructions. Consider a scenario: a firmware release introduces a new loop manipulation effect. The initial edition of the device instructions, naturally, lacks any mention of this capability. A later iteration, however, will detail the effect’s parameters, usage, and integration within existing workflows. Without this information, users remain unaware of the device’s expanded capabilities, limiting its potential. These newer capabilities are, of course, reliant on the specifications provided in the initial edition of the device documentation.

  • Errata and Clarifications

    Despite best efforts, initial printings may contain inaccuracies or ambiguities. User feedback and internal testing invariably uncover omissions or misleading passages. Revisions address these imperfections, providing corrected information and clearer explanations. Imagine a user struggling to implement a specific MIDI control function, only to discover that the original guide contained an error in the CC assignment. A later update rectifies this mistake, preventing further frustration and ensuring accurate implementation. Access to these corrections is vital for seamless operation and maximizing the equipment’s capabilities. A comprehensive list of errata is often included in revisions of the documentation.

  • Compatibility Updates

    The external environment in which the device operates is constantly shifting. Operating systems evolve, digital audio workstations update, and new MIDI controllers emerge. Revisions address these changes, ensuring continued compatibility with the latest hardware and software. A user attempting to integrate the equipment with a newly released DAW may encounter unforeseen compatibility issues. Access to compatibility updates, detailing specific settings and configurations, is crucial for maintaining seamless integration and avoiding operational conflicts. The details for integration are provided within the compatibility update documentation.

  • Language Translations and Accessibility Improvements

    Expanding the reach and usability of the equipment often involves translating the document into multiple languages and improving its accessibility for users with disabilities. Revised editions may include additional language options or incorporate features such as larger font sizes, screen reader compatibility, and alternative text descriptions for images. These enhancements ensure that a wider audience can access and understand the information, promoting inclusivity and maximizing the equipment’s global impact.

The dynamic relationship between product updates and the user’s documentation is key to the product’s life-cycle. The document does not exist in isolation; it evolves alongside the device itself, reflecting changes in functionality, correcting inaccuracies, and expanding its reach. A commitment to maintaining up-to-date documentation is a testament to the manufacturer’s dedication to user satisfaction and the long-term value of its product. By referencing these revisions, users ensure they are operating with the most accurate and comprehensive information available, unlocking the full potential of their investment.

Frequently Asked Questions

The path to mastering electronic music equipment is often paved with questions. A common wellspring of inquiries surfaces around the proper use of the equipment’s primary document. What follows seeks to address the most pertinent of those, drawing upon common experiences and addressing frequent misunderstandings.

Question 1: Why is there no reference within the materials to a feature observed in an online demonstration?

Consider the tale of a seasoned guitarist, eager to expand their sonic palette, who acquired the device based on a demonstration showcasing an advanced looping technique. Upon receiving the product, this individual scoured the printed resource, only to find no mention of the advertised functionality. The truth, often revealed through diligent research, lies in firmware updates. The online demonstration showcased a feature implemented in a later software revision. The guide, reflecting the initial release, omitted this advanced function. Lesson: always verify the firmware version and consult supplementary online material.

Question 2: What explains the discrepancy between the signal flow diagram and the actual audio output when using a particular effects chain?

A recording engineer, meticulous in their approach, carefully studied the signal flow diagram depicted, anticipating a specific sonic outcome from a series of chained effects. The reality, however, deviated significantly from the predicted result. The culprit? Often, the internal routing logic of the device introduces subtle variations not immediately apparent in the simplified diagram. More detailed analysis of effect interaction must be considered, often supplemented by online user communities to ensure a firm understanding of device audio-processing intricacies.

Question 3: When the audio output appears significantly weaker than expected, despite seemingly correct gain staging as specified, what is the cause?

A composer, frustrated by a persistent lack of volume, meticulously followed the gain staging instructions outlined in the booklet. The input levels were optimized, and the output settings were maxed, yet the resulting audio remained stubbornly anemic. A deeper investigation unveiled an impedance mismatch. The device, designed for a specific input impedance, was connected to a source with a vastly different value. The guide, while addressing gain staging in general, failed to explicitly highlight the critical importance of impedance matching. A pre-amp or DI box can resolve this issue.

Question 4: In the documentation, what precisely determines whether a procedure must be followed with rigid precision, or with liberty?

A novice user, paralyzed by fear of error, meticulously adhered to every instruction, treating each step as an immutable decree. The result? A stifled creative process, devoid of experimentation and personal expression. The truth is, while core operational procedures demand adherence, many parameters offer latitude for individual exploration. The key lies in distinguishing between essential functions (e.g., power supply requirements) and expressive controls (e.g., effect parameters). The former requires unwavering compliance; the latter invites creative experimentation. If the guide makes repeated references to “potentially damaging” operations, that should be a strong indication that the procedure should be precisely followed.

Question 5: Why does the index omit a specific term, despite that term appearing prominently in the document’s body?

An experienced sound designer, seeking information on a niche synthesis technique, confidently turned to the index, expecting immediate guidance. To their dismay, the sought-after term was conspicuously absent. This scenario highlights a common limitation. Indexes, while valuable, are not infallible. Their comprehensiveness depends on the meticulousness of the indexer. The absence of a term does not necessarily imply its irrelevance. Instead, it necessitates a more thorough exploration of the documentation’s body, employing search functions or manual scanning. Search for similar keywords in the index, or on a digital edition of the material.

Question 6: What accounts for the variations observed between different language translations of the same reference guide?

A multilingual musician, seeking to clarify a specific technical point, consulted translations of the device instructions in multiple languages. Discrepancies immediately surfaced. Phrases with literal and technical definitions varied noticeably. This underscores the challenges inherent in technical translation. Nuances are inevitably lost, and subtle shifts in meaning can occur. When precision is paramount, consulting the original language version, often English, is advisable. Consider that a device used by people with many different backgrounds and cultures will have many different use-cases.

The central theme woven through these questions is that while the document offers a solid foundation, its effective utilization demands critical thinking, supplemental research, and a willingness to adapt to unforeseen circumstances. Its successful use calls for not just adherence, but also an appreciation for what might lay beyond the printed word.

These clarifications hopefully illuminate some of the frequently encountered points of confusion, paving the way for a more informed and fulfilling creative journey.

Essential Guidance for the Discerning Looper

The pursuit of sonic mastery with complex electronic instruments necessitates more than rote memorization of specifications. The following guidance, distilled from years of observed usage and potential pitfalls detailed within the device literature, intends to offer crucial insights for those seeking to elevate their looping capabilities. Consider these not as mere suggestions, but as hard-earned lessons from fellow sonic explorers.

Tip 1: Prioritize Input Signal Integrity. The clarity of a loop hinges upon the quality of its source. Hiss, hum, or clipping introduced at the input stage will be perpetually amplified with each repetition. The equipment instructions devote considerable space to proper gain staging. Heed this. Ignoring those instructions is akin to building a castle upon a foundation of sand. It will invariably crumble.

Tip 2: Master the Art of Imperfect Loops. Embrace the subtle imperfections inherent in live looping. Flawless loops, while technically impressive, can lack character. The almost imperceptible variations in timing and tone, those human elements that often define musicality, breathe life into looped sequences. The operating instructions detail quantization settings, but judicious use of those settings is imperative. Resist the urge to sterilize the performance; embrace the human touch.

Tip 3: Explore the Depths of MIDI Control. The equipment offers extensive MIDI control capabilities, enabling remote manipulation of virtually every parameter. This functionality, often overlooked, unlocks a realm of expressive possibilities. Consider assigning loop start/stop, effect selection, and tempo adjustment to external foot controllers. The instrument specifications provide a comprehensive MIDI implementation chart. Use it. It is a gateway to seamless integration within complex performance setups.

Tip 4: Cultivate a Library of Pre-Prepared Loops. Spontaneity is vital, but preparation is paramount. Develop a collection of pre-recorded loops in diverse styles and textures. These serve as building blocks, providing a foundation for improvisation and experimentation. The device operating manual specifies storage capacity. Utilize it wisely. A well-curated library is a sonic arsenal, ready to deploy at a moment’s notice.

Tip 5: Practice the Discipline of Subtraction. Looping often tempts the user to layer upon layer, creating dense and chaotic textures. Learn the value of restraint. Subtraction, the art of selectively removing elements from a loop, can be as powerful as addition. The erasure is part of the performance, and contributes to the overall value of the piece. The equipment documentation details loop editing functions. Master these tools. Pruning is essential for maintaining clarity and focus.

Tip 6: Regularly Back Up Stored Loops. Data loss is an ever-present threat in the digital realm. Protect your creative efforts by regularly backing up stored loops to an external storage device. The equipment specification often provide the number of loops that can be held, and therefore the storage space. The instrument guide provides instructions for data transfer. Follow them diligently. The heartbreak of losing hours of work due to a corrupted memory is a lesson best learned vicariously.

These strategic points, while not exhaustive, provide a strong foundation for effective use of the device. By integrating these habits into workflow, the device will be elevated from a mere instrument into a powerful creative partner. The instructions are the beginning, not the end, of the journey.

In conclusion, understanding the device, while utilizing these more advanced points, is essential to success.

The Unwritten Symphony

The preceding exploration has navigated the depths of a seemingly straightforward subject: device instructions. However, the review reveals a narrative far more intricate than a mere collection of specifications. The manual, properly understood, becomes a key to unlocking creative potential, mitigating frustration, and ultimately, transforming the hardware into a conduit for musical expression. A deep study of the various sub-sections, diagrams, and updates, will contribute substantially to a satisfying ownership experience.

Just as a composer relies on a score, so too does the electronic musician depend on a clear and comprehensive guide. The device in question, despite its complexity, remains an instrument a tool waiting to be wielded. The challenge lies not simply in owning the equipment, but in mastering its nuances. By embracing the documentation, individuals embark on a journey of discovery, unlocking a world of sonic possibilities and weaving their own unwritten symphonies. As the music plays, it’s the operator’s job to read the sheet music.

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