The schematics are pretty basic... it's basically first year electromagnetism type stuff - you can learn how to read these things completely in a day or two.
Anyways I remember my first time with a soldering iron
I googled "How to mod a PS2"
I went to radioshack and bought my first soldering iron and some solder.
I then googled "How to use a soldering iron"
I wet some paper towels, plugged the soldering iron, got to work!!
5 hours later, I realized something.
I was trying to solder points I couldn't even see with my eyes, never mind touch with the soldering iron.
Compared to those tiny circuit boards, audio stuff is easy