Q: Why?? Jack is a matrix mixer! You can route anything to anything with Jack.

A: Well, we need something that cross-fades when we change the matrix connections. Jack would "click" when connections are added or removed. Also, we designed this mixer to help us practice and perform Ensemble Feedback Instruments [2015] (Muhammad Hafiz Wan Rosli, Karl Yerkes, Timothy Wood, Hannah Wolfe, Charlie Roberts, Anis Haron, Fernando Rincón Estrada, Matthew Wright).

Start the mixer with the CLI matrix. This takes a single argument, the length of a side of the square matrix.

$ git clone https://github.com/kybr/jack-matrix-mixer
$ cd jack-matrix-mixer
$ make # works on Linux and macOS; no Windows yet
$ ./matrix 5 # for a 5x5 matrix
$ ./test 5 # (on a separate terminal) provides a sine signal array

Control the matrix with OSC messages such as these:

/matrix ffff 0.1 0.3 0.5 0.7
/connect iif 0 1 0.333
/connect iifiif 0 1 0.0 1 0 1.0

Where the number of f in the type list of the /matrix message is N * N where N is the length of a side of the square matrix.

• test with JackTrip
• copy OSC protocol from the Max patch
• add automatic connection to JackTrip ports
• support several common topology
  • ring, star, trios, full

• add mutex to protect audio/network thread communication
• implement cross-fading
• note where to put locks
• implement OSC control (of absolute matrix state)
• integrate OSC library
• fix clicks at the block rate
  • you have to clear the output buffer before accumulating
• implement matrix mixing
• adapt to allow CLI option for N inputs/outputs
• remove globals
• make a compiling, running jack client app
• make a Github repository
• choose a license
• start a README