The Westlicht has MIDI ins and MIDI outs on 3.5mm TRS cables. You're going to be better off connecting the Performer directly to your DAW via MIDI and relying on the MIDI standards to start/stop/reset your sequencer.

As far as CV, look under the "CLOCK" section and you should be able to adjust the Performer's response to clock signal starting and stopping.
https://westlicht.github.io/performer/manual/#pages-midi-output