Musical structure: BPM, bars, time signatures, key/mode
Instrument identity: 30+ instrument families (synth, strings, brass, guitar, etc.)
Timbral control: 100+ timbre tags (warm, bright, gritty, glassy, etc.)
FX prompting: Reverb, delay, chorus, distortion, and more
Loop fidelity: Seamless, tempo-synced loops designed for layering

Usage with ComfyUI-FFMPEGA

These weights are auto-downloaded by the FFMPEGA Agent node:

The model (~3 GB) downloads on first use to ComfyUI/models/foundation1/.

Hardware Requirements

Foundation-1 uses a layered prompt system:

[Instrument Family], [Sub-Family], [Timbre Tags], [FX Tags], [BPM], [Bars], [Key]

Example: "Synth, Lead, Bright, Sharp, Saw, Detune, Delay Ping Pong, 140 BPM, 8 Bars, A minor"

These model weights are released under the Stability AI Community License.

✅ Free for non-commercial use
✅ Free for commercial use by entities with annual revenue < $1M USD
❌ Entities with annual revenue ≥ $1M need an Enterprise license from Stability AI