SoundMixer Pro

SoundMixer Pro is a free, open-source virtual microphone mixer with a built-in soundboard for Windows.

It captures your real microphone, lets you apply audio effects (EQ, noise gate, compressor), and mix in sound clips — all output through a virtual audio cable. Your chat partners in Discord, Zoom, or Teams hear both your voice and the sounds you play.

Think of it as a free alternative to Soundpad.

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Features

Virtual Microphone

• Routes your real microphone through the app and outputs to a virtual audio device
• Works with Discord, Zoom, Teams, and any app that accepts a microphone input

Soundboard

• Load audio files (MP3, WAV, FLAC, OGG, WMA, AAC)
• Play sounds over your voice — your chat partner hears both
• Assign global hotkeys to trigger sounds even when the app is in the background
• Trim clips visually with a waveform editor and precision auto-zoom
• Customize each sound with an emoji icon and a display name
• Drag and drop to reorder sounds
• Loop mode, per-clip volume control
• All sounds are stored locally — deleting the original file won't break anything

Audio Processing

• 10-band equalizer
• Noise gate (removes background noise when you're silent)
• Compressor (evens out volume)
• Gain control

Monitoring

• Listen to your own processed voice in headphones (optional)
• Listen to soundboard sounds independently from your voice

Interface

• 6 color themes (4 dark, 2 light)
• System tray with minimize-to-tray
• Optional Windows auto-start
• Settings auto-save

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Requirements

Requirement	Details
OS	Windows 10 or 11, 64-bit
Virtual Cable	VB-Audio Virtual Cable (free) — must be installed
Runtime	.NET 8.0 (included in the downloadable exe)

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Installation

Step 1 — Install VB-Audio Virtual Cable

This is required. Without it, the app has no virtual microphone to output to.

1. Go to https://vb-audio.com/Cable/
2. Download VBCABLE_Driver_Pack (the big Download button)
3. Extract the zip
4. Right-click VBCABLE_Setup_x64.exe → Run as administrator
5. Follow the installer
6. Restart your computer

After restart, open Control Panel → Sound → Recording tab and confirm that CABLE Output (VB-Audio Virtual Cable) appears in the list.

Step 2 — Download and run SoundMixer Pro

1. Go to the Releases page
2. Download SoundMixerPro.exe from the latest release
3. Run it (no installation needed — it's a single portable exe)

Step 3 — Configure

1. In SoundMixer Pro:

   • Microphone: select your real microphone
   • Virtual Cable: select CABLE Input (VB-Audio Virtual Cable)
   • Headphones: select your headphones/speakers (for monitoring)
   • Click Start

2. In your voice chat app (Discord, Zoom, Teams, etc.):

   • Go to Settings → Voice / Audio
   • Set Input Device to CABLE Output (VB-Audio Virtual Cable)

3. Done. Your chat partner now hears your voice + any sounds you play.

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How to use the Soundboard

1. Click + Add to load an audio file
2. Click the emoji button on a sound card to play it (click again to stop)
3. Click the gear icon on a card to open settings:
   • Rename the sound
   • Change the emoji icon
   • Adjust volume
   • Assign a global hotkey
   • Trim the clip
   • Export or delete
4. Drag and drop cards to reorder them

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Audio Signal Flow

Real Microphone ──▶ DSP (EQ, Gate, Compressor) ──▶ Mixer ──▶ Virtual Cable ──▶ Discord/Zoom
                                                     ▲
                                                     │
                             Soundboard sounds ──────┘
                                                     │
                                                     ▼
                                              Headphones (optional monitoring)

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Building from source

Prerequisites

• Visual Studio 2022 with the .NET Desktop Development workload
• .NET 8.0 SDK

Build

1. Clone the repository

   git clone https://github.com/YOUR_USERNAME/SoundMixer.git
   

2. Open SoundMixer.sln in Visual Studio
3. Set SoundMixer.App as the startup project
4. Press F5 to build and run

Publish a release build

Right-click SoundMixer.App → Publish → Folder, Release, win-x64, Self-contained, Single file.

Or via terminal:

dotnet publish SoundMixer.App\SoundMixer.App.csproj -c Release -r win-x64 --self-contained true -p:PublishSingleFile=true -o publish

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Technologies

• C# / .NET 8.0
• WPF
• NAudio (WASAPI audio capture and playback)
• VB-Audio Virtual Cable
• Newtonsoft.Json
• Hardcodet.NotifyIcon.Wpf (system tray)
• Win32 RegisterHotKey API (global hotkeys)

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License

MIT — see LICENSE.