I think my crossfader stop working for some reason. when im on side B i get sound then i slide over to side A and i still get sound from side be,,, all the assign are right also the bass mid and hi kill switch dosent work on side B should i replace the crossfader or buy a eniter new mixer. what should i do

Just check that is not cruded up and the brushes can't disconnect from one side of the fader remember contact cleaner and vasiline are your best friends

I suspect one end of the crossfader pot has broken from the element. The fader probably costs less than $5.

You likely will have to remove all the knobs and some screws to seperate the board with the fader from the front panel so you can replace the fader.

VERIFY the pot is bad with an ohmmeter before dis-assembling however.

You MAY be in luck. It looks like the cross fader has a connector which MIGHT allow you to remove it or certainly only a small board for replacement, seeing these take abuse.

It appears that the cross fader is a dual 100K type B taper.