Introducing WaveSpeedAI Ace Step Audio Outpaint on WaveSpeedAI

Seamlessly Extend Your Music with ACE-Step Audio Outpaint

The creative process of music production often hits an unexpected wall: your track sounds perfect, but it’s just not long enough. Maybe you need a more atmospheric intro to set the mood, an extended outro for a DJ mix, or simply more runtime to fit your video project. Traditional solutions involve tedious loop copying, awkward crossfades, or starting from scratch—until now.

WaveSpeedAI is excited to introduce ACE-Step Audio Outpaint, an intelligent audio extension model that seamlessly expands your existing tracks while preserving everything that makes your music unique: the rhythm, tone, emotion, and production style.

What is ACE-Step Audio Outpaint?

ACE-Step Audio Outpaint is built on the ACE-Step foundation model, a state-of-the-art music generation architecture developed collaboratively by ACE Studio and StepFun. Unlike traditional audio loopers or simple extension tools, ACE-Step uses a sophisticated approach that combines diffusion-based generation with Deep Compression AutoEncoder (DCAE) technology and a lightweight linear transformer architecture.

This technical foundation means the model doesn’t just copy and paste your audio—it genuinely understands your music’s harmonic structure, rhythmic patterns, and stylistic elements, then generates new content that flows naturally from (or into) your original track.

The model supports extensions of up to 4 minutes in a single generation, giving you substantial creative flexibility whether you’re adding a brief intro or building out a full extended mix.

Key Features

Bidirectional Extension: Add new audio segments before the beginning (intros) or after the end (outros) of your original clip—or both simultaneously
Natural Transitions: Newly generated audio blends smoothly with your existing material with no abrupt changes, key mismatches, or jarring tonal shifts
Flexible Duration Control: Specify exactly how many seconds you want to extend in either direction, from short transitions to multi-minute additions
Style and Genre Control: Use descriptive tags like lofi, hip-hop, drum and bass, trap, or chill to guide the musical direction of extended sections
Creative Consistency: The model maintains harmony, rhythm, tempo, and production aesthetics consistent with your source material
Optional Lyrics Support: Add or modify lyrics for vocal sections in your extensions
Reproducible Results: Use fixed seed values for consistent outputs, or set to -1 for creative variation

Real-World Use Cases

Music Production and Composition

Professional producers and bedroom musicians alike can use Audio Outpaint to explore creative directions without committing hours to manual composition. Generate multiple intro variations to see which sets the right tone, or create extended instrumental sections for remixing and live performance.

DJ and Live Performance

Building extended mixes traditionally requires careful beatmatching and crossfading between tracks. With Audio Outpaint, you can create smooth, stylistically consistent extensions that give you natural transition points, looping sections, and the runtime flexibility that live sets demand.

Content Creation

YouTubers, podcasters, and video producers constantly struggle with audio timing. Your perfect background track is 90 seconds, but your video runs 3 minutes. Rather than awkwardly looping or fading out mid-phrase, Audio Outpaint generates a genuine extension that maintains the musical journey throughout your content.

Film and Game Audio

Cinematic soundscapes and game audio often require precise timing to match visual cues. Audio Outpaint allows sound designers to stretch ambient tracks, extend tension-building passages, or add thematic intros that align perfectly with scene durations.

Podcast and Streaming

Create custom intro and outro music that perfectly fits your branding. Start with a core musical theme and extend it to your exact specifications—whether that’s a 10-second sting or a 2-minute opening sequence.

Getting Started on WaveSpeedAI

Using ACE-Step Audio Outpaint on WaveSpeedAI is straightforward:

Upload Your Audio: Provide an MP3 or WAV file of your existing track
Set Your Tags: Describe the genre or mood you want for the extended sections (e.g., “ambient electronic chill” or “upbeat indie rock”)
Configure Extensions: Specify how many seconds to extend before the start and/or after the end
Optional Lyrics: Add lyrics if you want vocal content in your extensions
Generate: Let the model create your seamless extension

The API returns your extended audio ready for immediate use in your projects.

Pricing That Makes Sense

At just $0.0002 per second of generated audio, Audio Outpaint is remarkably cost-effective. A 60-second extension costs just over a penny, making it accessible for experimentation and production at any scale.

Why WaveSpeedAI?

When you run ACE-Step Audio Outpaint through WaveSpeedAI, you get:

Instant Availability: No cold starts—your requests begin processing immediately
Optimized Performance: We’ve tuned the infrastructure for the fastest possible inference
Simple REST API: Clean, well-documented endpoints that integrate into any workflow
Predictable Pricing: Pay only for what you generate, with no hidden fees or subscriptions

The Bigger Picture

The AI music market is projected to reach $38.7 billion by 2033, reflecting the growing integration of AI tools into professional creative workflows. ACE-Step represents a significant step in this evolution—an open-source foundation that achieves performance comparable to commercial offerings while remaining accessible to everyone.

In blind evaluations comparing ACE-Step against other music generation models, the system scored approximately 85 in Emotional Expression, 82 in Innovativeness, 80 in Sound Quality, and 78 in Musicality—demonstrating that open-source AI can compete at the highest levels of music generation quality.

Start Creating Today

Whether you’re a professional producer looking to streamline your workflow, a content creator needing flexible audio solutions, or a musician exploring new creative possibilities, ACE-Step Audio Outpaint opens up new avenues for extending and enhancing your music.

Ready to extend your tracks seamlessly? Try ACE-Step Audio Outpaint on WaveSpeedAI and experience the future of intelligent audio extension.