Track ON-OFF issue

Today i have a problem, operating with Track mute channel…
In performance page track 2 and track 4 does not play…led dark end so on…
Same problem in NO performance mode activating track With Function switch with Track switch !!
TR2 and TR4 ever close…
So does anybody knows if is a good idea calibrating or what?
Many thanks Fred

I don’t think calibration is the solution to your problem, having said that, I don’t know what your problem is … something got lost in translation

Sorry for my terrible english…but the fact is that traxk 2,4 remain disabled!!