> Biggest obstacle is finding good, flexible, cheap sound analysis software,
> but that was 5 years ago.  May be common as dirt today.  Remember, you may
> need something a bit different than the software packages used to edit music.

Cheap software is useless for this purpose. Software doing what is
needed (FFT) costed 2 years ago around 800$ and I don't belive
you can get it cheaper today. Still - checking swarm tendencies
takes with a apparatus dedicated for this purpose 15-30 seconds.
Switching on and off included. It does not exist software available
designed for this purpose, so the computer is NOT telling you
directly what is going on in the beehive. You need to analyse what is
on the screen and you need to know what must be analysed. Which
means - to analyse sound from the beehive take minutes. For a
specialist.

\vov