There is no way after the audio has been compressed that you can tell what you have lost from it unless you also have the original uncompressed audio to compare it to. The way the systems like mp3 codecs work means that there are no scientific test signals that can easily measure the losses due to compression.
camille minichino wrote:
How can the amount of compression for the different audio file formats be determined by use of the test signals that Audition provides? Is there a tutorial that covers the use of the analysis elements of this page in determining the compression used in a specific audio file already recorded?
If you have the original, and you can match the amplitude levels carefully, you can subtract one from the other with Audition, and listen to/analyse the results. Good luck with that; it won't tell you anything useful at all.