FastSPI: Hacked the VUSplit function to work better

CHANGES:
+ Added a hack to the VUSplit function (multiplied the maxBounds to a
usable value). It 'works' but I don't like it. Recode imminent.

ADDED:
+ Actually added in previous commit. SD logging functionality (which
isn't being used in this commit). Helpful for debugging since we can't
send any data over the serial port because Audectra is using it.