Am having problems with changing channels. The footswitch works and lights up and I've tried sever different XLR cables, but it doesn't change from clean to OD channel all the time. Is there a way to change the channel without the footswitch in case I'm at a gig or am I stuck on the clean channel? I don't see a button on the head to change the channel, which is surprising. My Tourmaster 4212 has buttons on it to select a certain channel without its footswitch.
Also, for the Tourmaster 4212, is it possible to switch out just a pair of the power tubes or do I have to switch all of them out?
Also, for the Tourmaster 4212, is it possible to switch out just a pair of the power tubes or do I have to switch all of them out?