It's possible to assign the RC-300's Rhythm Guide so that its signal comes out of the SUB outputs only. This can be useful if you want to have the Rhythm sent to a separate channel on a mixer so that it can be processed separately from the main phrase (loop) tracks.

Here's how to assign this setting for all memory locations.

1. Press the SYSTEM button.

2. Press the parameter right button repeatedly to select "Sys:Rhythm Out." 

3. Turn the MEMORY/VALUE knob to choose "SUB."

4. Press EXIT when you're finished. The new setting is saved automatically.