Hi everyone, bought a kpa rack about 5 month ago , more than happy until yesterday noticed a large noise floor . Strangely enough it was only on some profiles predominantly on amps with distortion . Simply turning on a green scream for example on some profiles with moderate settings could yield a 50/50 Signal to noise ratio, and yes if I use the noise gate it does improve a lot but I can’t help feeling that the noise is still there underneath the signal . It sounds like it maybe electrical interference but strange how it isn’t on clean amps . Anybody else having this problem ? Thanks for any replies ?