Do It Yourself:

 quad-VCO
 dual-VC-ADDSR
 dual-VCF
   dual-VCA
 modulator
 divider
 mixer
 sequencer
 SampleHold
 power-supply
 keyboard
 MIDI2CV
 sounds

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vca front
see the back of it

This is dual voltage controlled amplifier. Both can be used independently, as cross-fader or panning amplifier. VCA core is made with discrete transistors.


Panel
INITIAL 1,2 knobs:
ammount of initial amplification for each amplifier (without external CV)
PAN knob:
controlls amplification difference between both VCAs
LIN/LOG switches
toggle VCA control response between linear and log (dB-like)
CV1, CV2 knobs:
attenuators of external control voltages for individual VCAs
CVX knob:
attenuator of externall x-fade/pan control voltage
Other two switches
change module function: dual VCA, cross-fader, panner, and couple two control inputs, which can affect VCAs independently, or both at the same ratio.
INPUTS:
IN1, IN2, CV1, CV2, CVX
OUTPUTS:
OUT1, OUT2

The latest updated schematics
krisak's design