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Is anyone aware of the MIDI protocol that the OP-1 looks for over USB for a clock signal when in the EXT sync setting?
My full sync chain is:
OP-1(#1) master clock -> usb midi host -> RK-004 hub -> OP-1(#2) receive midi clock(via USB).
The RK-004 is being used to send MIDI over the USB output, but the OP-1 doesn't seem to recognize it as a clock source when set to the EXT sync.
Is there a special MIDI protocol the OP-1 looks for over USB? Does it need an additional USB host to receive a MIDI clock?