Caustic Song file (optional):
Here's something I was working on recently. I wanted to try using only ModSynths, even for the percussion parts.
Instead of creating separate note patterns for each track, I just used one ModSynth as a Master and set it up to send its note patterns to a bunch of other slave ModSynths. Each of those has its own Arpeggiator, with its own sequences, patterns and automation. Playing a single chord in the Master ModSynth creates a bunch of intertwining parts that all fit melodically with the notes being played in the Master ModSynth. And the drum patterns are triggered by the Master ModSynth too. I have separate ModSynths for kick, snare, hi-hat and percussion (plus a bass part and a few synth lines).