RC-50 newbie question

[Tom Griesgraber <thossounds@aol.com>]

Hi folks,

A friend just loaned me a Boss RC-50 to check out. Does anyone here  
know if there's a way to kill the dry signal from the outputs, so that  
what comes out of it is only what's been recorded, and not what is  
being played live?   If you know how to do this, you're already a step  
up on Roland product support ;-)

Thanks for any tips!
Tom