Could anyone point me in the direction of a free app for OS X which will allow me to analyse the frequency spectrum of a sound file, (likely to be WAV, AIFF or FLAC or SHN if I don't convert to analyse)? I trade in lossless audio of live concerts and it is important to ensure that the quality is preserved. The easiest and quickest way to do this is to play each track for a few seconds and see what the frequency looks like. I already have the software to convert the audio files into wav and/or aiff, so that isn't a problem. Thanks to anyone who can help me. Remember, this has to be free as this isn't really a profession or hobby that you spend vast sums on. Just lots of blank discs, software/torrents to share the material and apps to test and convert.