Just ride the wave man - as I already have quite a few analogue and digital keyboards and such, I found myself using the OT to drive the external synths - allowing me to jam minus a computer.
Also, some of the FX are great to noodle away.
Turn on the OT and plough on - I found it to be my favourite of all the Elektron boxes I’ve owned (all of them so far, except the RYTM).
Learning curve: you bet
Frustrations: Plenty
Fun: LOADS!