Spetrographic imagery

[steve harley]

they whom i call Scot Hacker wrote:
> I'm trying to help someone find Mac software that can reveal 
> spectrographic imagery in audio files, a la:
> 
> http://www.bastwood.com/aphex.php
> 
> Looks like Metasynth can do it, but it's $500:
> http://uisoftware.com/MetaSynth/
> 
> Anyone know of inexpensive  or  OSS capable of visualizing audio this 
> way? (Bonus if it can also create audio based on imagery).

out of curiosity a quick search turned up a free iTunes 
visualizer plug-in which actually cites the Aphex Twin images as 
a motivation:

<http://www.dr-lex.34sp.com/software/spectrograph.html>

supposedly improved version:

<http://www.honto.com/av/>

and a relatively inexpensive application with lots of audio 
analysis features:

<http://www.audiofile-engineering.com/spectre.php>

(also found some more expensive tools)