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Score Synth

Score Synth · screenshot coming soon

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What this node does

Score Synth is the audio end of the symbolic-music lane. It takes a performance (from Score Performer or Click Track) and synthesizes it into audio using ComfyTV’s own SoundFont synthesizer — no external player required. Point it at a .sf2/.sf3 SoundFont from your resource library and it plays the notes with those instrument samples. Press ▶ Run to render on the backend; progress is reported as it works. The output is a COMFYTV_AUDIO clip you can preview, pass to audio stages, or Bridge into native ComfyUI. You choose a default General MIDI instrument (program), and optionally override the instrument per MIDI channel with a small JSON map — handy for multi-part performances where each channel is a different instrument.

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When to use it

  • You have a performance (from Score Performer or a click track) and want to hear it as audio, not just MIDI.
  • You want a specific instrument sound from a SoundFont you’ve added to the resource library.
  • You need per-channel instruments in one render (e.g. piano + bass + drums).

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Parameters

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soundfont

The SoundFont file name from your resource library (a .sf2/.sf3). If left blank, the synth uses its built-in fallback voices. If you name a file that isn’t in the library, the run fails with a “soundfont … not found” message.

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program

The default General MIDI instrument, default piano. The options are the GM program names; this instrument plays any channel you don’t override below.

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channel_programs

An optional JSON map of MIDI channel → GM program, e.g. {"0": "piano", "1": "acoustic_bass"}. Use it to assign different instruments to different channels of a multi-part performance. Values can be GM program names or raw program numbers. Invalid JSON is ignored.

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gain

Output level multiplier, 0.1–2.0 (default 1.0). Below 1 attenuates, above 1 boosts; back off if the render clips.

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performance (optional input)

The performance to render, type COMFYTV_TEXT — wire this from Score Performer or Click Track. Running with nothing wired fails with “Score Synth needs a performance”.

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Outputs

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Tips

  • SoundFonts live in the resource library — add your .sf2/.sf3 there first, then type its file name into soundfont.
  • For a multi-instrument mix, set program to the most common voice and use channel_programs only for the channels that differ.
  • If the result sounds hot or distorted, lower gain a little before re-rendering.
  • Score Performer — produces the performance this node renders.
  • Click Track — a metronome whose click also feeds this synth.
  • Chord Accompaniment — generates a performance from chord symbols.
  • Bridge — convert COMFYTV_AUDIO to/from native ComfyUI audio. See https://github.com/jtydhr88/ComfyTV/blob/main/docs/bridges.md