Hi, thx for the quick answer, I have a couple of vintage soviet synthesizers that I want to control with the computer. One of them the polivoks I had installed the synhouse midijack on and it works but still don't have control over other parameters. Another one the Aelita isn't midified yet but I want to try out this midibox if it will do what i think it could do, that is send control voltages to any parameter on the synth. So if I get this right each parameter has to be voltage controlled...could you give me a pointer no how to know if a parameter (filter cutoff, resonance filter adsr, vca adsr, vibrato, unison) is voltage controlled or not... can you measure it with a dmm or do i see it on the schemes? are there other possibilities except voltage controlled parameters? as you can see...a lot to learn :-) thx!