README.txt: reworked and simplified with focus on SC IDE and version 3.6
In.schelp: replaced AudioIn w/ SoundIn in reference, added loudness warning in example section
Knob.schelp: repositioned text in mouseOverAction example

display of current value wasn't readable on OS X.
Klang.schelp: changed 'filter' to 'oscillator' in methods section
DynKlang.schelp: changed 'filter' to 'oscillator' in methods section