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Have not tried it but it should work. In a Facebook group one member of „lessix“ confirmed that it is possible to sync two units (he owns two): https://lessix.bandcamp.comAnd i just discovered that it is possible to sync the op-1 to an iPad via usb cable and it sends and receives midi Start/stop.
…I was a party to that Facebook conversation mate, and he was talking shit. You can't sync two OP1s