"Was this CD mp3 sourced?"
I've been doing a fair amount of CD trading by mail lately. All the music is unreleased stuff, a mix of live concerts and unreleased studio tracks and demos. Some cds come as .wav files, some as .flac files which I convert and burn as .wav to cd. Occasionally, I get a cd that I can clearly hear was once an mp3, but I only hear it on my home stereo, and use my laptop to burn, which is usually nowhere near my stereo. What program can I use to figure whether a track or cd was mp3 sourced?
I run suse 10.0, and was trying to find a spectrum analyzer where I could look for the typically lost frequencies, but I can't seem to find one that shows the Hz on one axis, and the time on another. KWaveview would seem to do the job, but it appears to only look to mic or line inputs, and can't just be pointed towards a single file. I thought Audacity would do it, but it doesn't show the actual frequencies, so far as I can tell. What program can I use to get this type of spectrum analyzer? Or, is there some other way to tell if a track was once an mp3 without listening to it?