First of all, thanks a lot for answering so quickly, Will.
127 is supposed to correspond to 100% on all controls, as they start out as
chars, although I agree this sounds sightly out.
Changing it creates a dilemma, as it changes peoples perception of the
synth. While making additions I've been very careful to avid changing the
original sounds. Rather than changing the existing controls I would be more
inclined to add a tracking range switch somewhere - if there was enough
demand for it. Maybe a *1.5 checkbox so you could maybe go beyond 100%
Finally, though I used the same technique myself for such a whistle, I
think you're actually better off using subsynth and fiddling the bandwidths.
For example just increase the bandwidth of the fundamental and add reverb
:)