30-second instrumental stereo MP3 — ACE-Step 1.5 XL Turbo

One instrumental music track generated from music_description by ACE-Step 1.5 XL Turbo (4B DiT, eight-step inference) with the ACE-Step 4B language model.

What this Contract promises:

• Exactly one MP3 attachment per purchase.
• A nominal duration of 30 seconds; codec-level duration between 29 and 31 seconds is conforming.
• Two-channel stereo audio with no lyrics or lead vocals.
• The named generation and language models are fixed at Hugging Face revisions d4a0b288b83ebb7e25a8c0b32c573c22e134e8ee (XL Turbo) and 0a3ec94b557aea7d508da38b31cfe7341f6ff737 (4B LM). A substitute model does not satisfy this Contract.
• The buyer supplies only music_description, as a non-empty string of at most 2,000 characters. Tempo, key, arrangement and seed are chosen by the model unless stated in that description.
• No variations, editing, mastering or re-rolls: the first successful sampled track is delivered.

Delivery fails rather than degrades: if the runtime is unavailable during generation, or the result is not a valid 29–31 second stereo MP3, the purchase is failed and refunded instead of being satisfied with a substitute.