---
title: "Changes to 2種類のスタイルでモーフィングした音声を合成する"
method: POST
path: "/synthesis_morphing"
---

# Changes to 2種類のスタイルでモーフィングした音声を合成する

`POST /synthesis_morphing`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 15 of 36 revisions.

- **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` — 2 breaking, 2 warning, 2 info
- **2024-01-22** `ba5021ec9a6d` — 6 info
- **2024-01-20** `2a8c9cc0823a` — 2 breaking, 2 warning, 2 info
- **2024-01-17** `98b1b5ed5d83` — 1 breaking, 1 warning, 6 info
- **2023-10-07** `a93282ebb9a2` — 1 info
- **2022-02-26** `6ceee601dc21` — 1 info
- **2022-02-04** `4f999bbd6947` — 1 info
- **2021-12-22** `f3dbed7ca725` — 2 warning, 1 info
- **2021-11-06** `805081dba346` — 1 info
- **2021-08-01** `54e3a135bccf` — 1 breaking

## Changes

- **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 `_synthesis_morphing_synthesis_morphing_post` removed and replaced with `_synthesis_morphing`
- **2025-01-03** `b7afc41080b3` — 5 breaking, 1 warning, 2 info
  - added the new required request property `accent_phrases/items/pause_mora/pitch`
  - added the new required request property `accent_phrases/items/pause_mora/text`
  - added the new required request property `accent_phrases/items/pause_mora/vowel`
  - added the new required request property `accent_phrases/items/pause_mora/vowel_length`
  - the `accent_phrases/items/pause_mora` request property type/format changed from ``/`` to `object`/``
  - removed `#/components/schemas/Mora` from the `accent_phrases/items/pause_mora` request property `allOf` list
  - added the new optional request property `accent_phrases/items/pause_mora/consonant`
  - added the new optional request property `accent_phrases/items/pause_mora/consonant_length`
- **2024-10-05** `e86c0159e1bd` — 1 info
  - request property `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 `pauseLength`
  - added the new optional request property `pauseLengthScale`
- **2024-01-28** `2e8475c446af` — 2 breaking, 2 warning, 2 info
  - the `query` request parameter `base_speaker` became required
  - the `query` request parameter `target_speaker` became required
  - deleted the `query` request parameter `base_style_id`
  - deleted the `query` request parameter `target_style_id`
  - `query` request parameter `base_speaker` was reactivated
  - `query` request parameter `target_speaker` was reactivated
- **2024-01-22** `ba5021ec9a6d` — 6 info
  - added the new optional `query` request parameter `base_style_id`
  - added the new optional `query` request parameter `target_style_id`
  - the `query` request parameter `base_speaker` became optional
  - the `query` request parameter `target_speaker` became optional
  - `query` request parameter `base_speaker` was deprecated
  - `query` request parameter `target_speaker` was deprecated
- **2024-01-20** `2a8c9cc0823a` — 2 breaking, 2 warning, 2 info
  - the `query` request parameter `base_speaker` became required
  - the `query` request parameter `target_speaker` became required
  - deleted the `query` request parameter `base_style_id`
  - deleted the `query` request parameter `target_style_id`
  - `query` request parameter `base_speaker` was reactivated
  - `query` request parameter `target_speaker` was reactivated
- **2024-01-17** `98b1b5ed5d83` — 1 breaking, 1 warning, 6 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 `periodic_pitch`
  - added the new optional `query` request parameter `base_style_id`
  - added the new optional `query` request parameter `target_style_id`
  - the `query` request parameter `base_speaker` became optional
  - the `query` request parameter `target_speaker` became optional
  - `query` request parameter `base_speaker` was deprecated
  - `query` request parameter `target_speaker` was deprecated
- **2023-10-07** `a93282ebb9a2` — 1 info
  - added the new optional request property `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 `accent_phrases/items/is_interrogative`
- **2021-12-22** `f3dbed7ca725` — 2 warning, 1 info
  - for the `query` request parameter `morph_rate`, the max was set to `1.00`
  - for the `query` request parameter `morph_rate`, the min was set to `0.00`
  - api operation id `synthesis_morphing_synthesis_morphing_post` removed and replaced with `_synthesis_morphing_synthesis_morphing_post`
- **2021-11-06** `805081dba346` — 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/synthesis_morphing/post.md) · [API](https://skmtc.dev/voicevox/apis/voicevox-engine-oss.md) · [Page](https://skmtc.dev/voicevox/apis/voicevox-engine-oss/changes/synthesis_morphing/post)