By using the audio generated by SYNTH2 to apply high-speed modulation to the frequency (pitch) of the SYNTH1 oscillator, you can create sounds that have a complex overtone structure. To edit the cross modulation sound, you must first create a rhythm pattern for SYNTH1 and SYNTH2, and edit the sound while the pattern plays back.
Combinations other than SYNTH1 and SYNTH2 cannot be used. In some cases, the timing of when SYNTH1 and SYNTH2 sound may affect the tonal character or the volume.