I've had a basstation for while now. and I love it, but lately I can hear a constant whine about 3-4 octaves above the notes, this gets louder the longet the unit is on, and the voices are sounding a little out of tune/phase no matter what I do - any ideas as to what it could be?? it is repairable???

Since it's analogue , it may have OPP AMPS , check them out . Also sometimes the power supply can be developing a problem .