
A sung track: the prompt below set the arrangement and the script is what the model was given to sing. Copy the prompt, change a word and render your own.
What ACE-Step was given to sing, verbatim. Press play and it follows along.
Line positions are the rendered length divided by 2 lines. Neither model returns per-line timings and there is no forced aligner here, so the highlight follows the playhead approximately.
gentle lullaby, soft nylon-string guitar arpeggio, airy female vocal, quiet sustained strings, slow and tender, major key, 70 BPM
Every element in this prompt points the same way: nylon strings, airy, quiet, slow, tender. If any one element turns assertive, the lullaby stops working.
Listed as Apache 2.0 in the catalogue and flagged unverified there. Read the model card before shipping output commercially. Soundbox itself is MIT and imposes no terms of its own on what you generate.