Re: RG-16 Can I switch between two preamps before the powera
Sure, you can connect a preamp (or many preamps) as if they were distortion pedals: loop send to preamp input, loop return to preamp output. Then the last output of the RG-16 goes to the power amp input.
You just want to make sure that only one preamp is on at a time - you can use the grouping feature to group the buttons together so that only one can be turned on at a time.