Do they lose volume/signal when either using one amp or both? What are some good ones? The Tonebone looks interesting for $69 or there's a Morley that's only $40. I'm sure there are better ones too-what are the differences? The Tonebone has a reverse ground or something like that to prevent ground loop buzz. I have a Jcm800 single channel that I would like to be able to switch with my Traynor for cleaner sounds.