Sorry to derail this topic even more, but can someone recommend iOS synths with enough exposed midi parameters that would make full use of the 16 parameters per channel on the OP-Z? Basically, I like the idea of expanding the OP-Z with a Roland SH-4D, just without having an extra box on the table - I’d take just the software version please, happy to use the OP-Z dials and automation 
Try the Poison-202, really great sounding synth
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Bought it, looks like it‘s ticking all the boxes 