[sdiy] very cheap oscilloscope & signal generator?

[Paul Perry]

Something even cheaper, is a probe consistign of a capacitor going to a 
cable plugged into an amp - that way, you can actually hear the sound (or 
not!) at various points.
Plenty on the net - search diy audio probe - here's one:
http://diy-fever.com/index.php?project=audio_probe

And the cheapest audio signal generator is software on an old PC!
paul perry Melbourne Australia