To understand what those arrays of 32 bit floats represent you need to read a good introduction to Digital Audio.
If you're near a library 'The Computer Music Tutorial' by Curtis Roads may be useful. Specifically chapter one 'Digital Audio Concepts'. (It's been a long time since I read this book though).
Once you have an understanding of digital audio, there are many ways to manipulate it. When you're ready these links may help.
The Dsp + Plugin Development forum at KVR Audio is one place to ask questions. Posts here are generally split between general audio DSP and VST plugin topics.
MusicDsp has a lot of code snippets.
The Scientist and Engineer's Guide to Digital Signal Processing
Is an free online text book which goes into depth on standard DSP topics. Much of which also applies to digital audio.
