Additional Remarks:

MIDI channel, reference note for CV1 (this is the MIDI note corresponding to 0V of CV1 and thus the lowest possible note of the analog synthesizer connected to MCV4) and the controller no. for CV4 are adjusted via learn function. For this the learn button must be pressed and the required MIDI messages sent from the MIDI controlling device (MIDI synthesizer, keyboard, sequencer ...). The other parameters (retrigger, trigger polarity, assign mode ...) are adjusted in learn mode via program-change messages.
The Hz/V mode available in the predecessor model MCV1 is not available with the MCV4 because of the many problems occuring with the non-linear Hz/V characteristic. But some synthesizers normally using Hz/V can be be controlled with V/Oct (e.g. Korg MS10/MS20, details you may find in the MCV4 user's guide).
If you want to use all 4 analog control voltages you need 2 special cables with a stereo 1/4" jack plug on one end (MCV4 side) and two mono 1/4" jack plugs on the other (synthesizer side). It's nothing but a so-called "insert cable". You may get such cables from your local dealer but we also offer such a cable (MCV4 cable 1/4" stereo - 2x1/4" mono). If you need it we recommend to order it together with the MCV4.

More details can be found in the user's guide MCV4_man.pdf and on the FAQ page.