sure !!
i know this from my eurorack “official” expensive modules 
for this diy im also paying much attention about this, how i put the male ribbon connector on the board (which accept only one side of the connector) and how i wire the stripboard 
i built the mixer with the tl072, everything works!!
but i still didnt manage to fix the TONE control (the simple filter), somethingis wrong with my understanding of the circuit here:
the central leg of pot goes to capacitor and then to ground…?
what about the other leg? it goes to ground? to nothing?
i actually connected central leg with that leg + central leg to capacitor to ground… and it doesnt work… oscillators works but the this tone knob do nothing.
Change the cap to 100nF. Top pot leg to output. Central leg and bottom pot leg to one leg of cap. Other side of cap to ground. Its not a very drastic change in tone and most of the change is at the very extreme of the pot.
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thanks 
ill try tomorrow
if it’s not affecting that much the sound maybe i would skip this since in the same box i want to put kosmo’s simple low pass filter as well 