MIDI In from OPZ: can I play sounds in parallel?

Just got my OP 1 and my initial plan was to control it from OPZ from time to time.

As I understand, there is no way to play more than 1 sound from OP1, when notes are triggered externally from OPZ.

Am I correct or there is actually a way to play other sounds apart from the active (selected one)

Thanks!