I'm having lots of trouble trying to make my Radial Headbone to work with my amps, a Rivera Knucklehead 100 and a Soldano HR100+. Whenever I connect all this stuff together, using the correct cables, the correct connections, and all (I'm absolutely sure I'm hooking things up the right way) I get an annoying feedback howling out of the Rivera (that i never get when playing the amp by itself). This feedback goes away when i turn the gain down on the amp, but I can hear the tone sounding like there's something weird with the phase...it really sounds like there are two out of phase signals going. I emailed Radial but they never responded. So...one last pry for help before I throw the Headbone in the trash: Could it be that my Soldano and Rivera amps are out of phase with each other, thus causing all this mess??? If so, how can I fix that? Many thanks!