One thing I wish was included in the OP1f stock FX is some kind of distortion/saturation so I’ve been thinking of the easiest/most portable way to do that with external gear.
If you buy the Ableton Note app for iPhone and plug the iPhone into the OP1f you can resample OP1 sounds into the app’s sampler instrument where there are a bunch of FX units including a saturator which then you can sample back into the OP1.
Not ideal when having to resample twice but definitely more portable than using pedals/DAWs.