Open Source C++ Audio Mixers

Mixxx is a free and open-source DJ software that enables DJs to create professional live mixes using digital music files. It runs on Windows, macOS, and Linux, making it accessible to DJs across all major platforms. Mixxx supports both beginners using just a laptop and experienced DJs using advanced hardware setups. Built-in BPM and key detection help DJs quickly find compatible tracks and achieve smooth transitions. With strong community-driven development, Mixxx is continuously improved by DJs and programmers from around the world. As a fully open-source project, Mixxx is and will always remain free to use.

A program for windows, which turns your XBOX/XBOX360 USB controller into a MIDI controller, sending Control Change messages and/or Note messages.

Midi Mixer is a simple daemon used for controlling mixers volume levels via MIDI controller (raw midi device). Main part of this project is a set of C++ classes dedicated for work with MIDI, like MIDI I/O, MIDI messages... Now just for FreeBSD.

Dynics is an operating system for the 64-bit IBM-compatible PC, focussing on services for dedicated audio and MIDI processing. Dynics turns the PC into a powerfull and stable studio component. This is one step towards the DSC: Dynics Studio Computer.

JackFX is a python module for midi control and realtime audio effects processing built using the Jack Audio Connection Kit. Effects are stackable, and can be chained in any configuration with only a few lines of python code.

MC (Music Composer) will be a full digital home studio. It has a step-sequencer/piano roll, sampler, sound/midi recording/editing, full automation and full VST, LADSPA, JACK, REWIRE support (client+host). Includes top-notch VST plugins (the DGSS, Rev3D..)

Midi Toys is an app that turns Interesting Devices into Midi Instruments, Devices so far implemented are a wacom tablet and a ps2 style joystick. instruments include a drum machine and a mixer, with more to follow

Ninjam is a program made by cockos ( Reaper ...) to help musicians to play online , using a looping system based on bars count and delayed playing . A very interesting concept that Ninjam+ want to improve , by adding midi support and other " addons "

Open source OSX audio sequencing project with community functionality for collaborative music production/performance. This project is written in C++ and leverages the Apple Carbon framework.

PsycleII is now known as the Open Media Studio. The new sf.net project name is oms.

Graphical tools to manage Linux audio infrastructure (ALSA/JACK/LADSPA).

I recently updated VstBoard... it's been a while. The sources are on github now, and the infos on this page are not updated yet. An experimental VST host and plugin. Modular and programmable : create multiple setups (plugins parameters, audio and midi routing) and switch between them via automation or midi. Visit the homepage for more information : http://vstboard.blogspot.com

XController is a MIDI routing software for Linux and is intended to control several MIDI devices (hardware/software) via one master keyboard. This includes sending program changes, sysex etc. by one keypress. XController depends on the ALSA-Library.

Mac USB audio driver source for EMU CA0188- and CA0189-Based external audio devices. Existing products include EMU 0202 USB, EMU 0404 USB, and TrackerPre.

Windows USB audio driver source for EMU CA0188- and CA0189-Based external audio devices. Existing products include EMU 0202 USB, EMU 0404 USB, and TrackerPre.

µ/mjoo is a new kind of live composition software for the Linux operating system, introducing radical new user interface concepts.