ACE-Step
ACE-Step is an open-source 3.5B-parameter music generation foundation model co-developed by ACE Studio and StepFun. It synthesizes up to 4 minutes of music in just 20 seconds on an A100 GPU — 15x faster than LLM-based baselines — while achieving superior musical coherence and lyric alignment across melody, harmony, and rhythm. The model supports text-to-music, audio-to-audio remixing, lyric editing, audio inpainting, and audio outpainting. Licensed under Apache 2.0.
Why use ACE-Step for audio?
Natural voice generation
ACE-Step produces expressive, high-quality audio suitable for character dialogue, narration, and voiceover work.
Flexible content types
Supports a range of use cases from in-game dialogue and cinematics to marketing narration and social media content.
Fast iteration
Generate and refine audio content quickly, enabling rapid prototyping of character voices and sound design.
Character voiceover and dialogue production
Generate expressive character voices for in-game dialogue, cutscenes, and interactive narratives. Iterate on tone and delivery rapidly.
Marketing narration and promotional audio
Create professional voiceovers for trailers, app store videos, and social media content without booking voice talent.
Sound design exploration and prototyping
Quickly prototype sound effects, ambient audio, and musical elements to test creative directions early in production.