Regarding the MTC TEMPO MIDI SYNC function, the RC-300 loop station can:
- Send TX/Transmit Tempo MIDI sync data out to an external MIDI device
- But cannot RX/Receive Tempo MIDI sync data
This means if you want to use the RC-300 with a second MIDI device and want to MTC Tempo sync the tracks, the RC-300 must be set as the Master/Internal, unfortunately the RC-300 is not able to be a MIDI Replicant/slave device.
-> MIDI Sync = INTERNAL
More info: RC-300 Support