It can also happen that you have an old recording with a bad signal-to-noise ratio and you want to keep it in the best possible quality.

This is done using forensic type software and is at all times within the digital environment.

Audio Enhancement
Sometimes you want more analogue sound but you don't have the high-end equipment you need.
In case you want to improve your tracks, I can listen to them and pass them through my analog equipment, depending on the needs they have, and thus avoid using saturation plugins, since they all create aliasing problems.