You could also try messing with the RTRIG parameter on the Playback page of a Flex machine track to get a stutter sound. You could do this manually or assign an LFO or p-lock or…
Similarly, try the RTIM param on the same page and machine.
We all have different tastes regarding filters. Classic example is the Curtis chip filter used on DSI synths up until the release of the Pro 2 - lot of haters on that filter, but it’s got its fans too. Another is the MS-20 filter - plenty of haters and lovers alike. I like the OT filter, but don’t use it on anything that already has a filter that I like (eg. Microbrute, MS-20, etc.).
Other FX I use on the OT a lot: Dark Reverb, LoFi (great for tremolo too). On occasion I use Phaser, Flanger, and Comb Filter (works best on unpitched sounds like drums, thumps, scratches, etc.).