Emu XL-7 & MP-7 User's Group

I'm still debating on getting the XL-7, although I did spend some time on 
it at Guitar Center last week and liked what I saw so far.  But,is there a 
way to quickly solo a part, or even reverse the mute status of parts in 
the current pattern?  I asked the guy at the store (who was so proud to be 
"certified" after spending two days in Emu training) this question.  He 
just slid his finger across the mute buttons real quick, and it sorta 
worked.  I'd like to know if there's a more accurate way.

rEalm