I’m trying out iZotopes new audio restoration software RX (previous post). You can expect a full-blown review of it somewhere down the road. For a first test I found a really noisy old blues recording (and a field recording on top of that) from the 1940’s called “Shetland Pony Blues” played by Son House. I really didn’t do much processing with it but the results were still very noticeable. If I would restore this song “properly” I wouldn’t have settled with this… and I might not even have removed so much at one time as I think the guitar might have lost a little of it’s high end frequencies.
Anyway, have a listen to them. The first file is the original and the second is the processed file. The difference is most apparent in the beginning.