# presetRender > Part of the MAP Audio Music API docs. Index of every page: https://map.audio/developers/music-api/llms.txt. OpenAPI document: https://map.audio/developers/music-api/openapi.json. `POST https://api.map.audio/v1/preset/render` Render a PAM preset to WAV without opening PAM. The engine's own render command: one factory preset to one WAV, with optional stems and an input file that the preset's External cells play. POST /v1/renders is the render API for everything else (FLAC and MP3, variation and seed batches, cutdowns, quality search, previews); use this route for an input file or the exact `pam preset render` options. It costs render-minutes for the audio it renders: its length in minutes, at least 0.1 a render. Answers 202 with the queued job: poll `GET /v1/jobs/{id}`, stream `GET /v1/jobs/{id}/events`, or send `Prefer: wait=N` (at most 60 s) to get the finished job in this response. Auth: `Authorization: Bearer` with an API key or a map.audio access token. Send `Prefer: wait=N` (0 to 60) to receive the finished job when it ends within N seconds; otherwise the answer is `202` with the job. Send `Idempotency-Key` to retry safely: the same key and body return the same result for 24 hours. MCP tool: `preset_render`. ## Body | Field | Type | Required | Description | | --- | --- | --- | --- | | `preset` | string | yes | A factory preset reference, pam:factory/ or the bare slug; GET /v1/presets lists them. At most 200 characters. | | `seconds` | number | no | Render length in seconds; mutually exclusive with `bars`. Defaults to the input duration for fx and audio master. From 0.001 to 300. | | `bars` | integer | no | Length in bars (1..64): pattern generation uses four beats and defaults to 1; preset rendering uses the preset time signature and defaults to 4. From 1 to 64. | | `sampleRate` | integer | no | Output sample rate. From 22050 to 48000. Default `48000`. | | `tail` | number | no | Additional effect tail in seconds after transport stops. From 0 to 30. Default `0`. | | `seed` | integer | no | Reproducible seed; zero draws a random seed. From 0 to 4294967295. Default `0`. | | `variation` | integer | no | Preset variation, numbered from 1. From 1 to 16. | | `stems` | boolean | no | Write each cell stem alongside the master in one render pass. | | `input` | string | no | Audio played into the engine's input, through the PAM cells whose source is External. Without `seconds` or `bars` the render lasts as long as the input, plus `tail`. The id (file_…) of WAV or FLAC audio this account holds: a render output, or an upload once uploads open. Matches `^file_[0-9A-HJKMNP-TV-Z]{26}$`. | | `metadata` | map of string | no | Up to 20 string pairs stored with the job. At most 20 entries. | ## Example ```sh curl -sS "https://api.map.audio/v1/preset/render" \ -H "Authorization: Bearer $MAP_API_KEY" \ -H "Map-Version: 2026-11-01" \ -H "Prefer: wait=30" \ -H "Content-Type: application/json" \ -d '{"preset":"pam:factory/313-disco","bars":8,"seed":42}' ``` ### Request: Render 8 bars of 313 Disco with a fixed seed ```json { "preset": "pam:factory/313-disco", "bars": 8, "seed": 42 } ``` ### 200: Finished ```json { "object": "job", "id": "job_01M6BPRFPCH9EBPY7B6JKM7CE1", "operation": "presetRender", "status": "succeeded", "livemode": false, "sequence": 3, "progress": 1, "queuePosition": null, "createdAt": "2026-11-01T14:03:31.512Z", "startedAt": "2026-11-01T14:03:33.104Z", "finishedAt": "2026-11-01T14:03:41.877Z", "estimate": { "audioSeconds": 16, "renderMinutes": 0.267 }, "result": { "outputs": [ { "role": "master", "name": null, "cell": null, "file": "file_01M6BPRMNR7PYGFNA66BX2YJ8M", "sha256": "13d41d922519699fc14a7587130eceee7d0f149414350000578de1564866a0d4", "bytes": 4608044, "format": "wav", "sampleRate": 48000, "durationSeconds": 16, "url": "https://api.map.audio/v1/download/file_01M6BPRMNR7PYGFNA66BX2YJ8M?expires=1793545422&signature=GQ2GkmPjqXuxxBSSM4NKBCY7OjU7w3YSeZBrCoxxtbY", "expiresAt": "2026-11-01T15:03:42.000Z" } ], "seed": 42, "command": { "ok": true, "wavPath": "file_01M6BPRMNR7PYGFNA66BX2YJ8M", "sampleRate": 48000, "durationSeconds": 16, "seed": 42, "stems": [], "latencySamples": 0 }, "provenance": { "object": "provenance", "id": "prov_01M6BPRVA8ZC7F7J737SQ0EPN2", "jobId": "job_01M6BPRFPCH9EBPY7B6JKM7CE1", "createdAt": "2026-11-01T14:03:41.877Z", "engine": { "product": "pam", "version": null, "runtime": "native-linux-x86_64", "image": "registry.cloudflare.com/c7c2e61448617e81ced650f444fb6787/pam-render@sha256:5c5ffe3fabc103e277280fbd65a08988d31361f00fe7857e36f603d67bcec42d" }, "seed": 42, "presets": [ { "ref": "pam:factory/313-disco", "sha256": "3afbf5dea1003b2d17385955017785a57d74c65f77f97b58cf5d7cec9794ca1c" } ], "packs": [], "userFiles": [], "inputs": [], "outputs": [ { "file": "file_01M6BPRMNR7PYGFNA66BX2YJ8M", "sha256": "13d41d922519699fc14a7587130eceee7d0f149414350000578de1564866a0d4" } ], "planner": null, "contracts": { "api": "2026-11-01", "pam.cli": 1 }, "aiModels": [], "audioByModel": false, "license": { "id": "lic_api_prototype_test", "commercialUse": false, "attribution": true }, "kid": "6c2f0a9d4b7e1358", "signature": "ed25519:LEVZHpOHj8BMGZgJh-_Y7SmKbqDlBDR8LqY-XelU6GYK8lntZqg3rRK4b3BH8cy25bK0iWzOXFXmkiGHEYue7A" } }, "error": null, "usage": { "renderMinutes": 0.267, "audioSeconds": 16, "computeMs": 6273 }, "metadata": {}, "urls": { "self": "https://api.map.audio/v1/jobs/job_01M6BPRFPCH9EBPY7B6JKM7CE1", "events": "https://api.map.audio/v1/jobs/job_01M6BPRFPCH9EBPY7B6JKM7CE1/events", "cancel": "https://api.map.audio/v1/jobs/job_01M6BPRFPCH9EBPY7B6JKM7CE1/cancel" } } ``` ### 202: Queued ```json { "object": "job", "id": "job_01M6BPRFPCH9EBPY7B6JKM7CE1", "operation": "presetRender", "status": "queued", "livemode": false, "sequence": 1, "progress": 0, "queuePosition": null, "createdAt": "2026-11-01T14:03:31.512Z", "startedAt": null, "finishedAt": null, "estimate": { "audioSeconds": 16, "renderMinutes": 0.267 }, "result": null, "error": null, "usage": null, "metadata": {}, "urls": { "self": "https://api.map.audio/v1/jobs/job_01M6BPRFPCH9EBPY7B6JKM7CE1", "events": "https://api.map.audio/v1/jobs/job_01M6BPRFPCH9EBPY7B6JKM7CE1/events", "cancel": "https://api.map.audio/v1/jobs/job_01M6BPRFPCH9EBPY7B6JKM7CE1/cancel" } } ``` ### 402: Not enough render-minutes ```json { "error": { "type": "entitlement", "code": "insufficient_credits", "message": "This job needs 0.267 render-minutes and 0.012 remain this month; make it shorter, or buy render-minutes at https://map.audio/music.", "param": null, "details": { "needed": 0.267, "remaining": 0.012 }, "retryable": false, "jobId": null, "docUrl": "https://map.audio/developers/music-api/errors#insufficient_credits", "requestId": "9a3f7c2e5b1d8f40-LHR" } } ``` ## Responses - `200`: The finished job: `result.outputs` link each file it wrote and `result.command` is the engine's own result. - `202`: The queued job; poll `urls.self` or stream `urls.events`. - `402`: Not enough render-minutes - `default`: Any other error: `error.code` names it, `error.param` the field at fault, and `error.docUrl` its entry in the error catalogue. ## Errors - [`invalid_request`](https://map.audio/developers/music-api/errors#invalid_request) - [`unsupported_media_type`](https://map.audio/developers/music-api/errors#unsupported_media_type) - [`payload_too_large`](https://map.audio/developers/music-api/errors#payload_too_large) - [`terms_required`](https://map.audio/developers/music-api/errors#terms_required) - [`concurrency_limit`](https://map.audio/developers/music-api/errors#concurrency_limit) - [`idempotency_key_reused`](https://map.audio/developers/music-api/errors#idempotency_key_reused) - [`idempotency_in_flight`](https://map.audio/developers/music-api/errors#idempotency_in_flight) - [`queue_unavailable`](https://map.audio/developers/music-api/errors#queue_unavailable) - [`insufficient_credits`](https://map.audio/developers/music-api/errors#insufficient_credits) - [`render_too_long`](https://map.audio/developers/music-api/errors#render_too_long) - [`preset_not_found`](https://map.audio/developers/music-api/errors#preset_not_found) - [`preset_not_served`](https://map.audio/developers/music-api/errors#preset_not_served) - [`variation_not_found`](https://map.audio/developers/music-api/errors#variation_not_found) - [`not_found`](https://map.audio/developers/music-api/errors#not_found) - [`file_not_ready`](https://map.audio/developers/music-api/errors#file_not_ready) - [`file_expired`](https://map.audio/developers/music-api/errors#file_expired) - [`uploads_disabled`](https://map.audio/developers/music-api/errors#uploads_disabled)