noise from monitor/bad sound in deck 2

hi! sorry my bad english....
my proplem is in deck2 and monitor.
monitor is making electrisial sound when plugged in mixer.
and when i plug monitor in my sound card it is very loud and i cant get volume down...
also , sound is terrible in deck 2 when i use cds or vinyls
when i dont use cds/vinyls the sofware works just fine and no proplems.
when i calibrate my cds there are some small singnal showing in both decks(1deck normal/2deck small wave in it) even when cd is playing in deck 1(and same otherwise 2-1)
but only sound is bad in deck2 when playing, deck 1 is fine
i have grounded the u46 in my mixer and i have ok config report and everything should be right/ok...
could it be grounding issue ?
isnt enought when grounded in mixer, in my case?
any ideas....
my proplem is in deck2 and monitor.
monitor is making electrisial sound when plugged in mixer.
and when i plug monitor in my sound card it is very loud and i cant get volume down...
also , sound is terrible in deck 2 when i use cds or vinyls
when i dont use cds/vinyls the sofware works just fine and no proplems.
when i calibrate my cds there are some small singnal showing in both decks(1deck normal/2deck small wave in it) even when cd is playing in deck 1(and same otherwise 2-1)
but only sound is bad in deck2 when playing, deck 1 is fine
i have grounded the u46 in my mixer and i have ok config report and everything should be right/ok...
could it be grounding issue ?
isnt enought when grounded in mixer, in my case?
any ideas....