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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mixer front
Se also:
another view
backside

This is plain mixer, may be used also for DC signals, like control voltages. OP249 fast precision opamps were used for their low ofset and good dynamic parameters, but mostly because they are my opamps of choice at the moment. Master gain pot simply changes summer gain, so by adjusting it at appropriate levels it's impossible to overdrive even with all inputs fully open and active. Little helper - clip indicator lights up when output amplitude reaches limits of linear operation, i.e. when output dangerously reaches power rails causing distortion.
In my modular I use +/-12V power, but this circuit can work with any voltage from +/-5 to +/-15V. Master gain pot, not shown in the schematic is a 200k linear taper with shunt resistor selected to achieve unity gain when input and master pots are fully open.


Panel
MASTER knob:
master volume
IN1-IN6 knobs:
individual inputs attenuators
PEAK lamp:
clip indicator
INPUTS:
IN1-IN6
OUTPUTS:
OUT, INVERTED OUT

Schematics
krisak's design