Dave W. wrote:

If, as you say, the signal is clean, then as long as you have it
digitised there is no problem. Before saving it to any 'lossy'
compression method, simply amplify it in Audacity. This is a
mathematical operation, and the 'clean signal' will be end up being as
loud as you want it to be.


However as you amplify it, yo will also bring up the quantisation noise. It
is best to optimise your recording level first.

The effect can be reduced by ensuring you are recording at 24 bits
resolution.

geoff