Mod board for the Jasper synth adding two different XOR waveforms that sound like ring modulation.

XOR1 is Osc2 x LFO (most flexible with an LFO modded for higher rates)

XOR2 is Osc1 x Osc2

The outputs are placed on Osc2’s rotary switch (you’ll have to adjust the lock to allow two extra rotation positions)

(Following images are for a v1 Jasper. Pins may differ slightly in later revisions.)

(wire colours below don’t match the above diagram)