ACE Step Audio Inpaint

Audio to audio

Liveby fal

Modify a portion of provided audio with lyrics and/or style using ACE-Step

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How it works

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For developersSummary, tool id, API call and input schema

Voice & audio API by fal, callable through Superpowers. It costs $0.00108 per 5s clip, charged only when the call succeeds. Call it with one API key: POST /v1/run with "tool": "fal.ace-step-audio-inpaint", or over MCP with run_tool.

Tool id
Price per call: $0.00108 / 5s clip

Call it

Also over MCP as run_tool

curl -X POST https://superpowers.tools/v1/run \
  -H 'Authorization: Bearer $SP_KEY' \
  -d '{"tool":"fal.ace-step-audio-inpaint","input":{"audio_url":"","tags":""},"idempotency_key":"example-request-1"}'

Input

19 fields · 2 required

{
  "type": "object",
  "required": [
    "tags",
    "audio_url"
  ],
  "properties": {
    "tag_guidance_scale": {
      "type": "number",
      "description": "Tag guidance scale for the generation.",
      "default": 5
    },
    "end_time_relative_to": {
      "type": "string",
      "description": "Whether the end time is relative to the start or end of the audio.",
      "default": "start",
      "enum": [
        "start",
        "end"
      ]
    },
    "granularity_scale": {
      "type": "integer",
      "description": "Granularity scale for the generation process. Higher values can reduce artifacts.",
      "default": 10
    },
    "lyrics": {
      "type": "string",
      "description": "Lyrics to be sung in the audio. If not provided or if [inst] or [instrumental] is the content of this field, no lyrics will be sung. Use control structures like [verse], [chorus] and [bridge] to control the structure of the song.",
      "default": ""
    },
    "scheduler": {
      "type": "string",
      "description": "Scheduler to use for the generation process.",
      "default": "euler",
      "enum": [
        "euler",
        "heun"
      ]
    },
    "guidance_interval": {
      "type": "number",
      "description": "Guidance interval for the generation. 0.5 means only apply guidance in the middle steps (0.25 * infer_steps to 0.75 * infer_steps)",
      "default": 0.5
    },
    "start_time_relative_to": {
      "type": "string",
      "description": "Whether the start time is relative to the start or end of the audio.",
      "default": "start",
      "enum": [
        "start",
        "end"
      ]
    },
    "minimum_guidance_scale": {
      "type": "number",
      "description": "Minimum guidance scale for the generation after the decay.",
      "default": 3
    },
    "end_time": {
      "type": "number",
      "description": "end time in seconds for the inpainting process.",
      "default": 30
    },
    "guidance_scale": {
      "type": "number",
      "description": "Guidance scale for the generation.",
      "default": 15
    },
    "guidance_interval_decay": {
      "type": "number",
      "description": "Guidance interval decay for the generation. Guidance scale will decay from guidance_scale to min_guidance_scale in the interval. 0.0 means no decay.",
      "default": 0
    },
    "audio_url": {
      "type": "string",
      "description": "URL of the audio file to be inpainted."
    },
    "guidance_type": {
      "type": "string",
      "description": "Type of CFG to use for the generation process.",
      "default": "apg",
      "enum": [
        "cfg",
        "apg",
        "cfg_star"
      ]
    },
    "variance": {
      "type": "number",
      "description": "Variance for the inpainting process. Higher values can lead to more diverse results.",
      "default": 0.5
    },
    "tags": {
      "type": "string",
      "description": "Comma-separated list of genre tags to control the style of the generated audio. Can also be supplied as `prompt`."
    },
    "start_time": {
      "type": "number",
      "description": "start time in seconds for the inpainting process.",
      "default": 0
    },
    "lyric_guidance_scale": {
      "type": "number",
      "description": "Lyric guidance scale for the generation.",
      "default": 1.5
    },
    "seed": {
      "type": "integer",
      "description": "Random seed for reproducibility. If not provided, a random seed will be used."
    },
    "number_of_steps": {
      "type": "integer",
      "description": "Number of steps to generate the audio.",
      "default": 27
    }
  }
}