It may help although I'd be surprised if it made much difference.
With it being S.M. fiddling with stuff like that will need the eyes of a 16 year old and the fingers of a gynaecologist - I'm neither!
It just seems to be a poor design using el-cheapo bits. Perhaps changing the op-amps to some quieter (like a quad NE5534 - if such a thing exists)would help. It seems that the noise is less noticeable if they're driven with a higher signal level - the noise will still be there but won't be as noticeable. Perhaps more gain is needed earlier on so as to over-ride the inherent noise.
I reckon Nelson-Peach are just going to have to spend a bit more money on better kit.
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sj