MixMixer

MixMixer is a lightweight Windows system-tray application that routes your post–Equalizer APO microphone to VB-Audio Virtual Cable with minimal latency. Discord, games, and OBS use CABLE Output as the microphone input while your physical mic stays on the E-APO chain.

Screenshot

Signal flow

Physical mic (post E-APO) ──► MixMixer ──► CABLE Input ──► CABLE Output ──► Discord / games / OBS
                                  │
                                  └──► Headphones (optional monitor)

External soundboard / browser ──► CABLE Input (separate app; Windows mixes with voice)

• MixMixer forwards voice only to CABLE Input.
• Set Discord and games to CABLE Output — not the physical mic.
• Soundboard apps can send audio to CABLE Input independently; Windows mixes both streams.

Features

• Low-latency WASAPI capture and playback (Rust + cpal)
• iOS-style settings window (egui) with live latency metrics
• System tray: left-click or double-click opens settings; right-click → About / Quit
• Hide to tray on close or minimize (does not quit); taskbar click restores the window
• Live settings (no Apply): changes take effect immediately; listen volume is hot
• GitHub link in the footer
• EN / FR language chips in the header (locale in config or MIXMIXER_LANG)
• Auto-reconnect when Windows audio devices change (e.g. Discord switching devices)
• Optional headphone monitor bus
• Settings stored in %APPDATA%\MixMixer\config.json — created automatically on first run

Requirements

Component	Notes
Windows 10/11	x64
VB-Audio Virtual Cable	Required — install as administrator
Equalizer APO	Optional — VST chain on physical mic
Rust toolchain + MSVC	For building from source

Quick start

Download (recommended)

1. Download the latest Windows x64 build from Releases.
2. Install VB-Audio Virtual Cable if needed.
3. Run mix-mixer.exe — a default config is created at %APPDATA%\MixMixer\config.json (system mic + CABLE Input when present).
4. Confirm devices in the settings window, then set Discord / games / OBS microphone to CABLE Output.

No manual config.json copy is required.

Build from source

cd mix-mixer
cargo build --release
.\target\release\mix-mixer.exe

Wire your apps

1. Equalizer APO → physical microphone (optional).
2. MixMixer → captures that mic, outputs to CABLE Input.
3. Discord / GTA / OBS → microphone = CABLE Output.

Full walkthrough: docs/TUTORIAL.md

Configuration

User settings live in:

%APPDATA%\MixMixer\config.json

Created automatically on first launch with detected defaults. Print the path:

.\mix-mixer.exe --print-config-path

Optional override: .\mix-mixer.exe --config D:\path\to\config.json

Key	Default	Description
locale	system / en	UI language: en or fr (overridden by MIXMIXER_LANG)
devices.voice_input	Windows default mic	Capture device (post-E-APO mic)
devices.virtual_mic_output	CABLE Input when found	VB-Cable input endpoint
devices.monitor_output	default output	Headphone monitor output
monitor.enabled	false	Headphone monitor on/off
monitor.volume	1.0	Local listen level only (does not change Discord / CABLE)
buffer_frames	128	~2.7 ms @ 48 kHz; increase if crackling
enabled	true	Start with routing active
sample_rate	48000	Sample rate (Hz)

Device names use case-insensitive substring matching. Reference schema: mix-mixer/config.example.json.

Language

Use the FR / EN chips in the settings header, or edit locale in the AppData config. Runtime override:

$env:MIXMIXER_LANG = "fr"
.\mix-mixer.exe

All UI strings live in mix-mixer/src/i18n/.

Settings window

Control	Action
Header metrics	Routing state, estimated latency, buffer fill
FR / EN chips	Switch UI language (saved to config)
Enable routing	Master on/off for mic → VB-Cable
Device pickers	Microphone, virtual mic, monitor output
Headphone monitor	Toggle local monitoring
Listen volume	Level in headphones only (CABLE stays unity) — live
Buffer	Latency / stability trade-off — applied live
Close (×) / minimize	Hide window to tray (app keeps running)
Footer version	Opens the GitHub repository

System tray

Action	Effect
Left-click or double-click icon	Open / restore settings
Click taskbar window icon (when minimized)	Restore settings
Right-click → About	Show about dialog
Right-click → Quit	Exit MixMixer

Troubleshooting

Issue	Fix
Crackling / dropouts	Raise buffer_frames to 256 or 512
Device not found	Run --list-devices, edit %APPDATA%\MixMixer\config.json
Discord silent	Mic = CABLE Output; routing enabled in MixMixer
Silence after Discord device change	Wait for auto-reconnect; do not pick physical mic in Discord
Where is my config?	mix-mixer.exe --print-config-path or tray → About
Debug logs	$env:RUST_LOG='mix_mixer=info'; .\mix-mixer.exe

Development

cd mix-mixer
cargo build
cargo run -- --list-devices

Internal notes (French): docs/dev-mix-mixer.md

Contributing

See CONTRIBUTING.md. Bug reports and feature requests: GitHub Issues.

License

MIT — see LICENSE.

Changelog

See CHANGELOG.md.