I'm supposed to play my first show next week with my Line 6 DL4 that I bought on eBay maybe six months ago and suddenly today it started acting really weird. I've been Googling around and it seems like these pedals are really unreliable but I haven't seen any descriptions of the same problem I'm having, which is: signal comes through fine when the switches are disengaged (so I know my mic/cables/amp are not the problem), but as soon as I push any switch (on any of the effects) the lights go on (so I know the switches themselves are working) but suddenly no signal will come through. WHAT? Anybody have familiarity with these things? Would it be possible to fix myself? Am I totally screwed?