When syncing using MIDI clock, the RC-300 is capable of being a Master [only] to an external device. The RC-300 cannot be a sync "slave" to an external device - unless the second device is another RC-300.
The RC-300 can receive Program Change (PC) messages and Control Change (CC) messages from any external device.
When controlling an External MIDI device from the RC-300, the following MIDI data is transmitted:
- Tempo Data and Start /Stop commands (MIDI Clock)
- MIDI Program Change (PC) messages
- Control Change Messages (CC)
When controlling the RC-300 from an external MIDI Device, the RC-300 recognizes the following messages:
- Program Change (PC) - For Switching Phrase Memory Numbers
- Control Change (CC) - for controlling various parameters
For more detail on the RC-300’s various MIDI parameters, refer to the following pages of the RC-300 User Guide User Guide:
- SYSTEM SETTINGS > MIDI-Related Settings
- SETTINGS FOR EACH PHRASE MEMORY > Synchronizing the Tempo of Two RC-300 Units (MIDI Sync), Specifying the Controller (Assign Source)
The RC-300's Owner's Manual can be downloaded here: https://www.boss.info/global/support/by_product/rc-300/owners_manuals/