I posted a sketch yesterday, and this is a more coherently constructed version of the same patch.
Patch is on patch storage
The resulting track
Use a Valley Dexter FM Synth, but use every operator as a separately triggered voice. The operators still modulate each other but they don’t all sound at the same time, due to passing through vca/envelopes triggered by a random switch.
The drums are more conventionally sequenced, but by combining triggers from two rows and setting one row to random order, there’s a continuous rhythmic variation around a stable beat pattern.
Valley Plateau is the main send effect, and the decay and size are randomly varied.