Maybe you might consider a very small system only consisting of the modules needed to generate events, which are then controlling the other gear?
From my experience I can tell that most “standard” synths or “standard” sequencers just don’t have the flexibility, which is needed to get into generative music. There is almost always a lack of options, which allow a kind of “feedback” loop, which is driving and changing the events on and on … if this makes any sense.
AFAIK some guys here have experience with using midi feedback on the OT. The Pyramid should support this also, but I have never done this myself.
A pair of linked standard sequencers could also create interesting patterns over time (this would be sequencing a sequencer).
EDIT: For parameter fluctuations the Pyramid allows that midi-LFOs and midi-CC tracks are mixed. If this is used wisely, it can create pretty inertesting ever changing pattern. This I have tried with success. I think the same is possible with midi-tracks of the OT as well. If we additionally use tracks with different lengths or speed, we should get quite a controllable modulation mayhem