March 30, 2008 20:01
Well, if I understand what you want, seems the obvious place to start is MacENC or GPSNavX. The listening part can be done by either, using the 'monitor' window in the instrument and/or gps screen. You can take a sample then copy/paste into another application for analysis, such as a spreadsheet or word processor. I realize this doesn't do all you want, but lacking anything else it can be useful.
Scot
Scot