Ace Step Audio Outpaint

Ace Step Audio Outpaint

Playground

ACE-Step Audio Outpaint generates seamless start or end extensions that match the original, ideal for intros, outros and longer tracks. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

ace-step/audio-outpaint 🎵

ACE-Step Audio Outpaint is an intelligent music extension model from WaveSpeedAI that seamlessly expands existing audio tracks — adding new intros, outros, or transitions while keeping the same rhythm, tone, and emotion.

🌟 Key Features

• 🎧 Extend Before or After Add new audio segments before the beginning or after the end of your original clip.

• 🎶 Natural Transitions Newly generated audio blends smoothly with the existing material — no abrupt changes or mismatched tones.

• 🕒 Flexible Duration Extend by any length up to 4 minutes, perfect for building full-length versions or looping tracks.

• 🎼 Style & Theme Control Use tags (like lofi, hiphop, drum and bass, trap, chill) to define the musical direction of the extension.

• 🔁 Creative Consistency Keeps harmony, rhythm, and production style consistent with the original track.

⚙️ Parameters

💡 Use Cases

• 🎵 Add custom intros — Build a thematic or ambient start for your track.
• 🎚 Create extended mixes — Add smooth endings or looping sections for DJ sets.
• 🎧 Lengthen instrumentals — Extend beats or melodic sections for performance or remixing.
• 🎬 Audio production & film — Stretch soundscapes and background tracks for cinematic timing.

💰 Pricing

# Submit the task
curl --location --request POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/ace-step/audio-outpaint" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}" \
--data-raw '{
    "extend_before_duration": 0,
    "extend_after_duration": 30,
    "lyrics": "",
    "seed": -1
}'

# Get the result
curl --location --request GET "https://api.wavespeed.ai/api/v3/predictions/${requestId}/result" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}"