Ive been wanting to try one of these older line 6 amp just because of the stereo output and the line 6 edit tool. Ive had one of the XT live pedals and there is something fun about the deep editing on a laptop with the larger screen i enjoy. I ordered one used to the guitar center near me and went to pick it up last night and everything seem to work and sound ok. Then i asked if they could check to see if both channels worked and they couldnt get the right channel to work. The left "mono" channel worked but once hooked in stereo both speakers would not put out sound. I dont understand the impedance switch on this amp. I understand on tube amps but on SS amps? and why is there only 1 single switch for both channels? The manual isnt really clear about this switch. Im also wondering if maybe the right channel wasnt working because this switch needs to be in the correct position for stereo operation but for mono this switch might actually do something? I always thought Solid state only cared about minimum impedance? Solid state is only finiky when you get to low but anything OVER the minimum was fine?