A home made
module. It is a pair of VCA working as a CV
crossfader/mixer between direct signal (A9) and an
audio effect chain -the loop- connected between "Send"
& "Return" Jacks on the front panel. The output
of the mix between loop and direct sound goes directly
to the Matrix ( pin13). The mix level is controled
by CV coming from matrix output B9.
of the FX Loop (gif)