Thread: how to: MIDI in to modular arp?
Easiest option is a keyboard with an arpeggiator into your MIDI to CV module. I use the arpeggiator on the Sequential Prophet Rev2 into an ALM Mmmidi, but a Keystep and any MIDI to CV converter would work. A second option is to run an arpeggiating sequencer into a precision adder along with your MIDI to CV signal from your keyboard to transpose the sequence, but you are still going to have to adjust your arpeggios (up/down/random) in the sequencer. Voltage Block or Arpitecht might be worth looking into for arp modules.