Vintage Synth Repair

Hey there List!
Suddenly my Odyssey MKIII is not working properly. I can hear the normal hiss from the unit 
at normal volume and when I press the keys I can hear that normal low end clicking sound 
but the tones out of the oscillators and noise generator are practically gone.  I can still hear 
the oscillators working at a very very very low volume.  I move all the sliders and try 
everything but still not working like it was.  Since I got the thing I have replaced 
the key bushings and put some deoxit lube in the sliders.  The night before I was running a 
bass guitar through the audio input and messing with the sounds of that (not that cool 
sounding) with the filter.  I powered off the unit, then the next day powered it up and have 
this problem.  I opened it up and everything seems to look fine on the PCB board but I am 
not an expert.  Any thoughts?
Thanks much,
Dylan Nau