As for taking a chance with smoking the Butler, by using a Y-cable? the Butler may? not be squeezing out a ton of juice, but it's still an amp. And most amps that are not not configured or have the option to be bridged at the outputs remains sketchy in my mind to just go ahead and try it out to see what happens on power-up. I think I'm going to initially play it safe and go ahead and use an ISO box like the IMP Combiner or the Radial Mix-2:1 and see how that goes? What do you guys think?
The Butler is not an amp. It is a preamp. Those are not outputs like you find in an amp, but balanced audio outputs.
If that is too sketchy or bulky, you can get your dirt from a pedal, and use only the clean out.