Hey, i just recently discovered that my father has had a 25 watt Challenger for quite some time now. The problem with it is that there is constant tremolo. I believe this could be because the amp is lacking a footswitch. Is the problem with this amp that it does not have a foot-switch? When originally purchased should the amp had come with a foot-switch or is it separately purchased? Should I proceed with purchasing a new foot-switch for my amp? All Advice and concern for my dilema is greatly appreciated. Thanks.