Hey there, I'm currently trying to create an EQ unit with a set of band-pass filters, and audio adder and an audio subtractor, so that the bp~ signal mixed with the unaltered signal will produce a boost at the set frequency through the adder, and cut through the subtractor. While the adder works fine, the subtractor seems to produce just the bp~ signal without the main one, no matter which way I link the inputs. Is there something vital I'm missing here?

http://www.pdpatchrepo.info/hurleur/Readsf.pd

You can usually take consonants like this as being filtered noise, with a very quick transition into whatever vowel comes next. I think the centre frequency of the noise and the transition is what defines individual consonants from one another.
I found this page quite helpful:

https://ccrma.stanford.edu/CCRMA/Courses/152/speech_recognition.html