Running noise reduction on already compressed iles

[TimArends]

In browsing through my iTunes library, I sometimes find sound files with pops and clicks or hiss, etc., either because I digitized them before I got VinylStudio or for some other reason. These have already been saved as MP3 or AAC, the original AIFF files discarded.

How does re-running a compressed sound file through VinylStudio work? I know some data is thrown away when a file is compressed. Is it something like JPEG, where a little bit of quality is thrown away each time a file is opened, edited and resaved? De-popping or de-hissing is a major change, so I'm sure the sound file has to be recompressed all over again.

I have tried it and didn't really find that the sound deteriorated noticeably, at least to my untutored ears (and low-end equipment).

[Paul Sanders (AlpineSoft)]

Hi,

Yes, when you do this, VinylStudio decompresses the file (which doesn't lose anything), applies whatever filters / click repairs you have specified and then recompresses the file when you save your track(s).  So you will have compressed the file exactly twice, which is not too bad.  VinylStudio avoids doing this multiple times.