I have a mixer console (sound craft fx16). The slider controls have no bearing on volume.... Help. I've read the owners manul, played with all the buttons, etc. can't figure out what's wrong...

Let me know what info you need. If you'd like to come look, I can pay your gas and lunch. It's an old system I'm trying to get back into shape to save some budget money, finished cleaning up the wiring today and it seems correct .. But the sliders aren't working...

Basic setup - input to mixer, to equalizer, to amp, to speakers (l/r stereo, no sub).... Cheap school, lol

Thnxs guys