# ACE Step Audio To Audio API

> Ath-mheasgaich trac a tha ann mu thràth no cuir faclan eile na àite, air an stiùireadh le tagaichean tùsail is ùra

Tòisichidh e le `audio_url` agus na `original_tags` aige, agus cuiridh e `tags` ùra an sàs gus an stoidhle atharrachadh. Tha `edit_mode` an dàrna cuid remix, a dh’atharraicheas an fhuaim san fharsaingeachd, no lyrics, a dheasaicheas dìreach na thathar a’ seinn. Faodaidh tu `original_lyrics` agus `lyrics` ùra a thoirt seachad, agus `original_seed` ma tha fios air. Tha na paramadairean cheumannan is stiùiridh co-ionann ris a’ chòrr den teaghlach.

- Model id: `ace-step/audio-to-audio`
- Made by: ACE Studio
- Category: Text to Music
- Output: audio
- Price per second of your input audio: $0.0002 / second of input audio (cheapest run $0.001 (1 API credit))
- Run: `POST https://api.doitong.com/v1/run/ace-step/audio-to-audio`
- Quote: `POST https://api.doitong.com/v1/quote/ace-step/audio-to-audio`
- Docs page: https://doitong.com/gd/developers/models/ace-step/audio-to-audio

## Pricing

Price: **$0.0002 / second of input audio**. Price per second of your input audio: the input files are measured before the run (length, resolution, frame rate). The quote measures the same files and is exactly what the run charges.

The full example input below costs $0.002 = 2 API credits (10 s input audio × $0.0002).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.com/v1/quote/ace-step/audio-to-audio` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `audio_url` | `audio` | string (audio URL) | yes |  |  | URL faidhle claisneachd airson outpainting. |
| `edit_mode` |  | enum (string) | no | `remix` | `lyrics`, `remix` | Modh deasachaidh: atharraich na l lyrics a-mhàin no dèan remix den chlaisneachd. |
| `original_tags` |  | string | yes |  |  | Tagaichean a bha co-cheangailte ris an fhaidhle claisneachd bho thùs. |
| `original_lyrics` |  | string | no | `` |  | Lìrics a bha co-cheangailte ris an fhaidhle claisneachd bho thùs. |
| `tags` |  | string | yes |  |  | Tagaichean stoidhle claisneachd air an solar mar ghnèithean sgaraichte le cromagan, le `prompt` ri fhaighinn mar dhòigh eile air an solar. |
| `lyrics` |  | string | no | `` |  | Lìrics sheinnte, le earrannan na h-òrain air an eagrachadh le smachdan leithid [verse], [chorus] agus [bridge]. Airson claisneachd gun l tomaics sheinnte, fàg an in-chur seo air falbh no solar dìreach [inst] no [instrumental]. |
| `number_of_steps` |  | integer | no | `27` | 3 – 60 | Àireamh nan ceumannan a thèid a chleachdadh rè gineadh na claisneachd. |
| `seed` |  | integer \| null | no |  |  | Sìol airson gineadh ath-riochdachail, air a thaghadh air thuaiream mura solar thu luach. |
| `scheduler` |  | enum (string) | no | `euler` | `euler`, `heun` | Clàr-ama a thèid a chleachdadh rè gineadh. |
| `guidance_type` |  | enum (string) | no | `apg` | `cfg`, `apg`, `cfg_star` | Seòrsa CFG a thèid a chleachdadh rè gineadh. |
| `granularity_scale` |  | integer | no | `10` | -100 – 100 | Sgèile granularity a thèid a chur an sàs rè gineadh. Dh’fhaodadh àrdachadh air lùghdachadh a dhèanamh air nithean fuadain. |
| `guidance_interval` |  | number | no | `0.5` | 0 – 1 | A’ chuibhreann de chlàr-ama a’ ghineadh a gheibh stiùireadh: le bhith a’ taghadh 0.5, tha e air a chuingealachadh ri ceumannan bho 0.25 * infer_steps tro 0.75 * infer_steps, a’ fàgail an toiseach agus an deireadh gun stiùireadh. |
| `guidance_interval_decay` |  | number | no | `0` | 0 – 1 | Lùghdachadh stiùiridh taobh a-staigh na h-ùine gineadh: cumaidh 0.0 lùghdachadh à comas; air dhòigh eile, lùghdaichidh an sgèile thar na h-ùine sin bho guidance_scale gu min_guidance_scale. |
| `guidance_scale` |  | number | no | `15` | 0 – 200 | Sgèile an stiùiridh a thèid a chur an sàs rè gineadh. |
| `minimum_guidance_scale` |  | number | no | `3` | 0 – 200 | An sgèile stiùiridh as ìsle a ruigear às dèidh lùghdachadh rè gineadh. |
| `tag_guidance_scale` |  | number | no | `5` | 0 – 10 | Sgèile stiùiridh nan tagaichean a thèid a chur an sàs rè gineadh. |
| `lyric_guidance_scale` |  | number | no | `1.5` | 0 – 10 | Sgèile stiùiridh nan l lyrics a thèid a chur an sàs rè gineadh. |
| `original_seed` |  | integer \| null | no |  |  | Sìol a bha co-cheangailte ris an fhaidhle claisneachd bho thùs. |

File parameters (`audio`) take a public `https://` URL, a `data:` URI up to 10 MB, or the `file_url` of an upload from `POST /files`.

## Example input

Required parameters only:

```json
{
  "tags": "lofi, hiphop, drum and bass, trap, chill",
  "audio": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
  "original_tags": "lofi, hiphop, drum and bass, trap, chill"
}
```

A fuller example:

```json
{
  "tags": "lofi, hiphop, drum and bass, trap, chill",
  "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
  "original_tags": "lofi, hiphop, drum and bass, trap, chill"
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.com/v1/run/ace-step/audio-to-audio?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
    "original_tags": "lofi, hiphop, drum and bass, trap, chill"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.com/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.com/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/ace-step/audio-to-audio?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
    "original_tags": "lofi, hiphop, drum and bass, trap, chill"
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.com/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
    "original_tags": "lofi, hiphop, drum and bass, trap, chill",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/ace-step/audio-to-audio", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.com/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "ace-step/audio-to-audio",
      "input": {
        "tags": "lofi, hiphop, drum and bass, trap, chill",
        "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
        "original_tags": "lofi, hiphop, drum and bass, trap, chill"
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "ace-step/audio-to-audio",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 2,
    "usd": "0.002",
    "charged": 2,
    "refunded": 0
  },
  "input": {
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
    "original_tags": "lofi, hiphop, drum and bass, trap, chill"
  },
  "output": {
    "audio": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp3",
      "content_type": "audio/mpeg",
      "file_name": "0-output.mp3",
      "file_size": 1843200
    },
    "seed": 42,
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "lyrics": "[inst]"
  },
  "outputs": [
    {
      "type": "audio",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp3",
      "content_type": "audio/mpeg",
      "file_size": 1843200,
      "duration": 12,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `audio` | object {url, content_type, file_name, file_size} | Faidhle claisneachd a chaidh a chruthachadh le gineadh. |
| `seed` | integer | Sìol air thuaiream a chaidh a chleachdadh rè gineadh. |
| `tags` | string | Tagaichean gnè a chaidh an cur an sàs rè gineadh. |
| `lyrics` | string | Lìrics a chaidh an cur an sàs rè gineadh. |

## Related models

- [ACE Step](https://doitong.com/developers/models/ace-step.md) (`ace-step`): $0.0002 / second
- [ACE Step Audio Inpaint](https://doitong.com/developers/models/ace-step/audio-inpaint.md) (`ace-step/audio-inpaint`): $0.0002 / second of input audio
- [ACE Step Audio Outpaint](https://doitong.com/developers/models/ace-step/audio-outpaint.md) (`ace-step/audio-outpaint`): $0.0002 / second of output audio
- [ACE Step Prompt To Audio](https://doitong.com/developers/models/ace-step/prompt-to-audio.md) (`ace-step/prompt-to-audio`): $0.0002 / second
- [MiniMax Music 3](https://doitong.com/developers/models/minimax/music-3.md) (`minimax/music-3`): $0.002 / second
- [DiffRhythm: Lyrics to Song](https://doitong.com/developers/models/diffrhythm.md) (`diffrhythm`): $0.001 / second
- [Elevenlabs Music](https://doitong.com/developers/models/elevenlabs/music.md) (`elevenlabs/music`): $0.60 / minute of output audio
- [Elevenlabs Music v2](https://doitong.com/developers/models/elevenlabs/music/v2.md) (`elevenlabs/music/v2`): $0.60 / minute of output audio

## Links

- HTML page: https://doitong.com/developers/models/ace-step/audio-to-audio
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=ace-step/audio-to-audio
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/ace-step/audio-to-audio