Hi synth lovers, I was wondering what you guys use in you're sdiy racks and if you could point me to sources/schematics for : - CV/SIGNAL MIXERS - VCA (signal in, cv in lin & cv in log preferably) - VC ADSR I would want to use it with the Living VCO PCB from Juergen Haible & possibly Analogue systems/Doepfer modules thx ! Benjamin