Nick Bontrager demos a basic voice synth patch, using a Doepfer synth and a number of oscillator/patch bays.

He explains the patch:

By talking, the pitch of my voice is triggering a number of gates which will generate new audio based off incoming ramp waves from the various oscillator bays. So what you are actually hearing when I flip the switch is not my voice, it is just the 12-15 different oscillating patterns emulating my pitch.