Digital Noise !!!

[Scratsh]

Hail !

I will start to mix a CD.... i got the tracks on a Cake Walk and everithing is a good reccord but i got a problem:

There's a strange noise and a high-freqüency and a low-frequency present on all tracks..... i know that on each track was used many quantises, dithers and compression (background digital and ambient noise is loder i think...)...

I got many digital noise reductions, noise gates, and many equalizers.... anyone can help me how to start to clean this sounds before start to mix it ?

I have no idea how to reduce quantize, dither, luoder noise on a track.... i got many separated tracks.... it is easier than a mastering !

Thanks !!!

 

[F_cksia]

I can't say which noise-reduction equipment you have to use, cause I don't know what kind of noise/hiss it is. Just try several possibilities you've got and see which one works best for this noise.