backchannel
Windows x64
For Windows 10 or later on 64-bit Intel or AMD processors.
- Download
Backchannel-windows-x64-v0.2.3.zip. - Unzip it and run
Backchannel.exe. - If SmartScreen appears, choose More info, then Run anyway.
Release v0.2.3
Stable live audio startup and split-track attribution
Backchannel v0.2.3 stabilizes live audio startup and speaker attribution for calls with one local microphone user and remote participants on system audio.
Download Backchannel v0.2.3
These unsigned open-source builds are delivered through the authenticated Backchannel portal. An approved Backchannel account is required; no GitHub identity or repository membership is required. The first run includes the normal Windows SmartScreen or macOS Gatekeeper prompts.
macOS Apple Silicon
For Apple Silicon Macs. Intel macOS builds are not included in this release.
- Download
Backchannel-macos-arm64-v0.2.3.zip. - Unzip it and move
Backchannel.appwherever you keep apps. - Right-click
Backchannel.appand choose Open the first time.
Linux x64
A portable bundle for 64-bit Intel or AMD Linux systems.
- Download
Backchannel-linux-x64-v0.2.3.tar.gz. - Extract it with
tar -xzf Backchannel-linux-x64-v0.2.3.tar.gz. - Run
Backchannel/Backchannel.
What changed
This patch release stabilizes live audio startup and speaker attribution for split-track calls.
One capture pipeline
Rapid Start, Resume, End, or delayed browser permission prompts can no longer create duplicate capture pipelines or duplicate call segments.
Split-track attribution
Microphone speech binds to the sole configured local user without consuming remote speaker slots, while system-audio participants retain normal diarization.
Stable capture topology
Queued, reconnect-flushed, and final audio preserve the capture topology, and diarization returns to normal mic-only behavior when system sharing ends.
First-run notes
| Need | What to do |
|---|---|
| Release access | Use the email and password for your approved Backchannel recipient account. |
| Provider key | Add a Gemini key in Admin -> API Keys after launch. Add OpenAI only if you route agents to OpenAI. |
| Speaker labels | During split-track capture, the physical microphone maps to the sole local user. Voices from a shared tab or system source remain remote speaker clusters. |
| Upgrading | Quit the old version from the tray before starting the new one. Session data is stored per-user and is shared by every version. |
| Desktop launch | Backchannel opens a browser at a local localhost address and remains available from the system tray or menu bar. |
| Docker | Check out the v0.2.3 source tag and rebuild Compose to run the same release through containers. |
Start with the desktop app or self-host the stack
Both paths run Backchannel on your machine. Choose the desktop bundle for the fastest start, or Compose for maximum control.