8 - QUAD VCA MIXER :
In fact it is a mixture of 2 modules: a VCA (Voltage Control Amplifier) and a MIXER (to mix different signals to only one output.
INPUT : this is the signal input
CV INPUT : controls the gain of the VCA, typically comes from an envelope generator, or an LFO
INVERT SWITCH : When activated, an offset equivalent to +5.6V is added to the input CV, this is typically used with inverted envelopes that are at 0V at rest and go negative when active, that way, the audio signal passes continuously and when an inverted envelope arrives the audio signal is reduced or even completely cutoff.
INDICATOR LED VCA : to signal what voltages are affecting the VCA
VOLUME POT : potentiometer to adjust the output level of the VCA
OUT : OUTPUT individual output for each VCA channel. When a jack is plugged into one of these outputs, the corresponding signal no longer goes to the mixer.
ON/OFF OUT SWITCH : to select to open or not each channel out.
INDICATOR LED ON/OFF OUT : to indicate which channel is open (not muted)
GENERAL OUTPUT : or Master OUTPUT it’s the output jack if you want to mix all the input together
GENERAL VOLUME OUT pot : potentiometer for adjust the level of the MASTER OUTPUT.
It’s a QUAD VCA MIXER module so it’s the same things 4 times (for the other pots, switches and jacks)
Example of a simple patch with this module :
A VCO OUT in the INPUT 1 of the VCA MIXER + a LFO OUTPUT to drive the CV INPUT of the VCA MIXER
Another VCO OUT (or the same but the first OUT of Triangle wave and the second OUT of the Saw wave) into the INPUT 2 of the VCA mixer, the same LFO (the VCLFO has several outputs) to drive the CV INPUT 2 of the VCA MIXER and test this channel with the INVERT SWITCH (the 2 VCOs will respond)
take the MASTER OUTPUT of the VCA MIXER in your system.
if you have seen the other small simple patches of the other modules, you can therefore as well before the VCA MIXER pass the VCO through a VCF, also the LFO first by the ADSR …