Scaling, Bug Fixes and Reset

Fixed some minor bugs with unhandled exceptions, made scaling update
whenever any control is changed, added sensitivity (partially coded by
Jurek from the CUE in Strathclyde Uni) which works on the faders, lower
values decrease fader sensitivity while high values increase it, faders
now initialise to 63, the middle of their range, so that they start with
a value of 0 after sensitivity and scaling adjustments