Legacy professional tier for turning lyrics into songs and working with existing music projects
FUZZ-1.1 Pro is the legacy professional tier in the Riffusion FUZZ series, suitable for organizing song themes, lyrics, and sonic direction into listenable musical works. On this platform, you can create through the Producer or Riffusion audio entry points and obtain audio links and song information. It is especially suitable for projects that continue to use this version, rather than the default choice that bundles all new-generation music tools together.
Input parameters and result formats vary by service. Use the public API for this model and follow its guide for generation, task retrieval and editing operations.
Specifications and interface features
Clarify capacity, inputs and outputs, and invocation methods before choosing a model.
audio_id references an existing song for use in corresponding editing tasks
Time positioning
Continuation start points and clip replacement boundaries are expressed in seconds
Generation results
JSON result array, including audio_url, lyrics, title, status, and duration
Task method
Supports async asynchronous tasks and callback_url callbacks
The above describes the inputs, outputs, and controls of this platform's creation entry points and does not represent native capacity metrics; editing actions are performed according to the actual support of the entry point and model used.
Core Capabilities
Learn what FUZZ-1.1 Pro can bring to your work.
Start with a theme, or start with lyrics
When lyrics are not yet written, use prompts to describe the song's theme, mood, and sonic direction; when lyrics already exist, submit the text and title through custom mode. These two approaches allow FUZZ-1.1 Pro to participate in inspiration exploration and to turn a defined lyric concept into a preview track.
Organize lyrics and sonic direction separately
Lyric content and sound descriptions can be prepared separately, making it easier to distinguish between “what to sing” and “what it should sound like.” The Riffusion entry provides style, while the Producer entry uses prompt to describe the creative direction. This is suitable for finalizing lyrics first and then comparing different arrangement and mood options, rather than rewriting the full creative brief every time.
Results can enter project management workflows
Generated results provide not only audio links, but also song ID, title, lyrics, status, and actual duration, making it easy to save works and link follow-up tasks. The asynchronous approach can first obtain task_id, then query or receive callbacks, allowing previewing, selection, and archiving to fit into the normal workflow of music creation applications.
Use Cases
Start from specific tasks and find where the model can make an impact.
Preview demos for original lyrics
Enter completed verse and chorus lyrics, then add a song title and sonic direction to generate preview demos for creators to discuss. The focus is on judging the overall feel after the words are set to music, then deciding whether to revise the lyrics or try another arrangement direction; the deliverables are audio works and their associated information.
Exploring directions for content soundtracks
Prepare theme and mood descriptions for short videos, podcasts, or event content, and use lyric-free mode to explore soundtrack directions. After previewing, provide suitable work links and actual durations to editors for selecting material and arranging pacing; do not treat duration requirements in natural language as precise editing instructions.
Continued creation for existing version projects
For song projects that already use FUZZ-1.1 Pro, retain the model selection, lyrics, and sound description to continue producing candidate works. When an existing song needs editing, prepare audio_id and clear modification goals, then use an appropriate continuation or segment replacement task, saving the new results for comparison and previewing.
How to choose this model
Choose based on task complexity, input materials, and expected results.
When to keep FUZZ-1.1 Pro
If a project has already established listening preferences around FUZZ-1.1 Pro, or needs to maintain the same version's creative conditions as existing works, it is worth keeping. FUZZ-1.1 is the standard tier of the same generation, while FUZZ-1.0 Pro is another historical version; do not judge differences solely by the Pro name, and compare results using the same lyrics and vocal requirements.
How to compare later versions for new projects
For brand-new projects, you can compare FUZZ-2.0, FUZZ-2.0 Pro, and this model by listening: the former is the general recommended tier, the latter is for professional production, while FUZZ-1.1 Pro retains the value of a historical professional-tier option. Make trade-offs based on lyric presentation, musical direction, and required editing tasks, and do not apply all features of later versions to this model.
Getting started: prepare an iteratable draft for an existing song
Arrange the inputs first, then proceed to the corresponding application workflow.
Prepare inputs
Prepare lyrics, vocal direction, and the existing work ID, and clarify whether this time you are changing only the style or one section.
Organize calls and follow-up workflow
Submit the creation using the exact FUZZ-1.1 Pro invocation value; select the prompt, lyric, and title fields for the corresponding entry point, and save the task_id and work ID. Complete the listening review first, then choose follow-up actions according to this model's documentation, without mixing in editing fields from other tiers.
Practical task example: prepare an iteratable draft for an existing song
Design tasks directly from the following inputs and acceptance priorities.
Recommended task
First generate a clear version through the corresponding entry point, then select editing operations supported by this model; modify only one creative goal at a time.
Key checks
Compare the lyrics, melody, and section transitions before and after modification, and keep a record of changes; Pro in the title does not mean that all tools from other versions can be used.
Usage Limitations
Before formal use, understand the output quality and capability scope.
FUZZ-1.1 Pro should not be used to plan delivery based on fixed duration, fixed sampling rate, or a fixed number of outputs. Applications should read duration and audio_url from the actual results before arranging review and editing; audio links also do not necessarily represent directly editable multitrack project files.
The actions and parameters for the Producer and Riffusion endpoints are not completely identical. For example, instrumental-related actions use swap_instrumentals and swap_sound respectively. When migrating existing calls, adjust the task names, sound descriptions, and result parsing accordingly rather than only changing the request URL.
Instrumental creation must still comply with the endpoint's required field requirements. Do not omit lyric on your own simply because instrumental is enabled. Seed and strength fields should also not be treated as guarantees of note-by-note control, exact audio reproduction, or a specified singer's voice; important results still require listening-based acceptance.
Frequently Asked Questions
Answers to common questions about using FUZZ-1.1 Pro.
Are FUZZ-1.1 Pro and FUZZ-1.1 the same model?
No. They are different tiers within the same generation. FUZZ-1.1 Pro is the historical professional tier, while FUZZ-1.1 is the standard tier. Clearly specify FUZZ-1.1 Pro when calling it; when choosing, you can compare results using the same lyrics and sound direction without assuming a fixed degree of audio quality improvement.
I have already written lyrics. How can I make it generate a song?
Use generate and enable custom mode, then submit lyric; you can also provide a title and sound direction. The Producer endpoint requires action, lyric, and prompt; the Riffusion endpoint requires action and lyric, and can use style to describe the style.
Can it generate music without sung lyrics?
You can use instrumental mode without lyrics and describe the music direction around mood, instrumentation, and purpose. It is suitable for soundtrack candidates and instrumental previews; requests must still retain the fields required by the endpoint, and the final length should be read from the generated result rather than treating length descriptions in the prompt as a hard guarantee.
How should I choose between the two audio endpoints?
Existing Riffusion creation workflows can continue using /riffusion/audios; use /producer/audios for the Producer workflow. Both can specify this model, but their field and action names differ, so keep request construction and result parsing consistent with the selected endpoint.
How do I obtain FUZZ-1.1 Pro audio results?
After the task is complete, read audio_url from data to obtain the audio, and save the song ID, title, and status. When using async=true, save task_id first, then query for the completed result; you can also configure callback_url to receive callbacks and associate the returned work with the original creation task.