So up to this point, the BOSS RC-300 can't be the MIDI tempo sync slave of anything other than another RC-300.
Can the new BOSS RC-600 be the master MIDI sync to the RC-300?
Looking at the manual online, I'm afraid the answer may be "no," but the manual doesn't show the menu trees, so maybe?
I'd like to know before I buy one because I already have an RC-300 and I'm planning on live-looping with another musician who would use my old RC-300.