---
title: "Changes to 複数まとめて音声合成する"
method: POST
path: "/multi_synthesis"
---

# Changes to 複数まとめて音声合成する

`POST /multi_synthesis`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 16 of 39 revisions.

- **2026-10-19** `9adfe4501140`: 12 warning
- **2026-09-27** `bea1c63c3d6f`: 2 info
- **2025-06-17** `defa0e760ef0`: 1 info
- **2025-03-02** `d8b6a60f88af`: 1 info
- **2025-01-03** `b7afc41080b3`: 5 breaking, 1 warning, 2 info
- **2024-10-05** `e86c0159e1bd`: 1 info
- **2024-06-28** `3b94f9a50fd2`: 2 info
- **2024-01-28** `2e8475c446af`: 1 breaking, 1 warning, 1 info
- **2024-01-22** `ba5021ec9a6d`: 3 info
- **2024-01-20** `2a8c9cc0823a`: 1 breaking, 1 warning, 1 info
- **2024-01-17** `98b1b5ed5d83`: 1 breaking, 1 warning, 3 info
- **2023-10-07** `a93282ebb9a2`: 1 info
- **2022-02-26** `6ceee601dc21`: 1 info
- **2022-02-04** `4f999bbd6947`: 1 info
- **2021-09-21** `81c1320af255`: 1 info
- **2021-08-01** `54e3a135bccf`: 1 breaking

## Changes

- **2026-10-19** `9adfe4501140`: 12 warning
  - the `items/outputSamplingRate` request property's exclusiveMinimum was set to `0.00`
  - the `items/speedScale` request property's exclusiveMinimum was set to `0.00`
  - the `items/accent_phrases/items/accent` request property's min was set to `1.00`
  - the `items/accent_phrases/items/moras/items/consonant_length` request property's min was set to `0.00`
  - the `items/accent_phrases/items/moras/items/vowel_length` request property's min was set to `0.00`
  - the `items/accent_phrases/items/pause_mora/consonant_length` request property's min was set to `0.00`
  - the `items/accent_phrases/items/pause_mora/vowel_length` request property's min was set to `0.00`
  - the `items/pauseLength/anyOf[subschema #1]/` request property's min was set to `0.00`
  - the `items/pauseLengthScale` request property's min was set to `0.00`
  - the `items/postPhonemeLength` request property's min was set to `0.00`
  - the `items/prePhonemeLength` request property's min was set to `0.00`
  - the `items/volumeScale` request property's min was set to `0.00`
- **2026-09-27** `bea1c63c3d6f`: 2 info
  - added the optional property `detail/items/ctx` to the response with the `422` status
  - added the optional property `detail/items/input` to the response with the `422` status
- **2025-06-17** `defa0e760ef0`: 1 info
  - added the new optional `query` request parameter `enable_interrogative_upspeak`
- **2025-03-02** `d8b6a60f88af`: 1 info
  - api operation id `multi_synthesis_multi_synthesis_post` removed and replaced with `multi_synthesis`
- **2025-01-03** `b7afc41080b3`: 5 breaking, 1 warning, 2 info
  - added the new required request property `items/accent_phrases/items/pause_mora/pitch`
  - added the new required request property `items/accent_phrases/items/pause_mora/text`
  - added the new required request property `items/accent_phrases/items/pause_mora/vowel`
  - added the new required request property `items/accent_phrases/items/pause_mora/vowel_length`
  - the `items/accent_phrases/items/pause_mora` request property type changed from no type to `object`
  - removed `#/components/schemas/Mora` from the `items/accent_phrases/items/pause_mora` request property `allOf` list
  - added the new optional request property `items/accent_phrases/items/pause_mora/consonant`
  - added the new optional request property `items/accent_phrases/items/pause_mora/consonant_length`
- **2024-10-05** `e86c0159e1bd`: 1 info
  - request property `items/pauseLength` list-of-types was widened by adding types `null` to media type `application/json`
- **2024-06-28** `3b94f9a50fd2`: 2 info
  - added the new optional request property `items/pauseLength`
  - added the new optional request property `items/pauseLengthScale`
- **2024-01-28** `2e8475c446af`: 1 breaking, 1 warning, 1 info
  - the `query` request parameter `speaker` became required
  - deleted the `query` request parameter `style_id`
  - `query` request parameter `speaker` was reactivated
- **2024-01-22** `ba5021ec9a6d`: 3 info
  - added the new optional `query` request parameter `style_id`
  - the `query` request parameter `speaker` became optional
  - `query` request parameter `speaker` was deprecated
- **2024-01-20** `2a8c9cc0823a`: 1 breaking, 1 warning, 1 info
  - the `query` request parameter `speaker` became required
  - deleted the `query` request parameter `style_id`
  - `query` request parameter `speaker` was reactivated
- **2024-01-17** `98b1b5ed5d83`: 1 breaking, 1 warning, 3 info
  - response property `detail/items/loc/items/` list-of-types was widened by adding types `integer` to media type `application/json` of response `422`
  - removed the request property `items/periodic_pitch`
  - added the new optional `query` request parameter `style_id`
  - the `query` request parameter `speaker` became optional
  - `query` request parameter `speaker` was deprecated
- **2023-10-07** `a93282ebb9a2`: 1 info
  - added the new optional request property `items/periodic_pitch`
- **2022-02-26** `6ceee601dc21`: 1 info
  - added the new optional `query` request parameter `core_version`
- **2022-02-04** `4f999bbd6947`: 1 info
  - added the new optional request property `items/accent_phrases/items/is_interrogative`
- **2021-09-21** `81c1320af255`: 1 info
  - endpoint added
- **2021-08-01** `54e3a135bccf`: 1 breaking
  - api path removed without deprecation

---

[Operation](https://skmtc.dev/voicevox/apis/voicevox-engine-oss/docs/multi_synthesis/post.md) - [API](https://skmtc.dev/voicevox/apis/voicevox-engine-oss.md) - [Page](https://skmtc.dev/voicevox/apis/voicevox-engine-oss/changes/multi_synthesis/post)