What's your favorite gear to pair with your OP-1?

I’ve seen some posts about a hub/SD drive that is helpful and some that use Volcas, iPads, etc.

What’s your favorite piece of gear to pair with your OP-1? Something small and portable too!

IConnectMIDI4+ might be the gear I use most with OP1, as it enables me to get other gear to talk (and at least sync) with OP1.
Then I’d say any Elektron machine, as OP1 versatility makes it a good friend for any gear : drum machine for a synth, poly for mono, bass for leads and the reverse of these… Just had a jam session with a whole band yesterday and it did could fit any situation !