[Tutor] capturing/analysing sound data

[Matt]

Hello everyone,
	I'm currently attempting to write a small guitar tuner app (I know 
there are several out there, but I'm utilizing it as a learning 
experience.)  I've searched and read docs for about 8-10 hours, but I 
still haven't deduced exactly how to capture sound data (I'm running 
Debian 3.0 with OSS) so that I can analyse it.  I'm also not exactly 
sure how to handle constant input(sound data)/output(tone analysis), but 
it can be tackled after handling small test samples/analysis.  If anyone 
has any advise or can point me in the right direction, I'd greatly 
appreciate it.

Thanks,
Matt