ComfyUI Workflow: Generating Instrumental Music with Stable Audio 3 & ACE-Step
wjc_5 · reddit · 2026-08-02
The author shares a ComfyUI workflow that transforms short musical ideas and target durations into prompts, using both Stable Audio 3 and ACE-Step 1.5 XL to generate two instrumental tracks from the same plan.
Model Comparison:
- Stable Audio 3: More flexible across various styles, handling retro 8-bit game music and cyberpunk BGM naturally. However, longer tracks tend to expose noticeable repetition issues.
- ACE-Step 1.5 XL: Better for arrangements requiring clear structural changes. Its instrumental structure script can separately describe the intro, theme, variation, build, climax, and outro.
Technical Details:
The workflow uses a local text-generation node to create a strict JSON music plan, which is then split into specific prompts, BPM, time signature, and key. If local generation is too slow, users can bypass it by using a web LLM and pasting the JSON back. The author recommends starting with 2–3 minute tracks and has uploaded a comprehensive YouTube tutorial.
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