a little loss of signal from RBI
 

Bought this thing used, love it...for the first time I started playing with the 50/50 button in back and the next day a little loss of signal to the power amp...you can see the level drop on the led or whatever they are nowadays in front...then jumps back up after a little bit.

It's a older RBI. And it never did this until I started playing with that button. Have looped the effects and it is fine.

Maybe dirty contacts? Do you guys think little contact cleaner is in order?