cb-pitch-shift 0.2.1

An audio filter that transposes a source up or down by whole semitones without changing the tempo, plus a dock for changing the key with one click during a stream. Made for karaoke and cover streams: put the backing track on a Browser or Media source, add the filter, and raise or lower the key to suit the singer. The microphone on its own source is not affected.

Features
- Transpose from -12 to +12 semitones, tempo preserved. 0 is a bypass with no added latency.
- Dock: pick the target source, change the key with - / +, reset to 0, see the current value. Shows a warning when the source's audio is not routed through OBS.
- About 60 ms of audio latency when active. Add a Render Delay filter to the same source if you need exact sync.
- UI in English, 繁體中文, 简体中文, 日本語, 한국어 and Español.

Requirements
OBS Studio 31.1 or newer. Windows (installer or ZIP), macOS (.pkg, not notarized) and Linux (.deb or per-user install).

Documentation and support
Install and usage steps with screenshots: https://github.com/ChiwaBots/cb-pitch-shift#readme (also in 繁體中文 and 日本語).
Bug reports and questions: https://github.com/ChiwaBots/cb-pitch-shift/issues

Source and license
https://github.com/ChiwaBots/cb-pitch-shift, GPL-2.0-or-later. The pitch-shift DSP is the MIT-licensed Signalsmith Stretch library.

AI disclosure
Parts of this plugin were written with an AI coding assistant (Anthropic's Claude via Claude Code): the C++ filter and Qt dock, the CMake and CI configuration, the locale files and the README. The DSP library was not. Design, code review and testing were done by a person, and each release is installed and checked in OBS on Windows, macOS and Linux.

This is a third-party plugin and is not affiliated with the OBS Project.