[PD] Real-time frequency filtering and analysis

[Jared]

Summary: I'm interested in capturing audio through a microphone and, in 
real time, determining which frequency range (from a set range of 
frequencies) has the maximum level. This would be used to determine 
which note is loudest out three notes.

More info: Hello! I was hoping to get some direction for a project I'm 
working on. I'm also searching the mailing list archives, but I 
apologize in advance if I ask questions that have been answered 
elsewhere. If you think my question has already been answered, I would 
appreciate any advice on how to better search the archives to find what 
I'm looking for.

I am creating a staged adaptation of a 'Choose Your Own Adventure' 
novel. For more information, check out the Wikipedia article at 
http://en.wikipedia.org/wiki/Choose_your_own_adventure The important 
thing to know is there will be a branching storyline, decided by 
audience voting.

For the voting, I plan for everyone in the audience to have a small 
xylophone with 3. Each note will correspond to a voting choice presented 
by the cast. I'm going to have microphones positioned around the theatre 
to capture the xylophones and pipe them to a computer. What I'd then 
like to do through PD is determine which note was 'loudest,' meaning the 
most people cast it for their vote.

The voting choices will be displayed by a projector connected to the 
computer running PD. Thus, I'm interested in either piping the level 
information to another program (PowerPoint or something else) to display 
which vote won. I'd also be interested in doing this directly through 
PD, if it's possible.

I'm working my way through the PD tutorials included in the program 
itself, but would appreciate any advice or suggestions on keywords I can 
use to search the archives.

Please let me know if there is any information I can add to make things 
more clear. Thanks in advance for all your help.
-Jared