[Jon Dobbins]

I am trying to create an accelerating race car/ boat motor special effect
with a synth. While I can create the tones/ modulation I need with the
synth, I cannot create a somewhat constant acceleration (on the order of 2
octaves) for the resulting tone. I have since transferred a long tone
sample, looped it, and then applied accleration (speed resampling) curves in
software. I have also added effects, such as reverb, to try and attempt to
get a more natural sounding acceleration but therein lies the problem: the
acceleration I get from speeding up the wave file doesn't sound the same as
a natural acceleration I would get from a motor. The tones just seem to get
too bright and thin when acceleration becomes high. How can I get around
this and make the "accelerating motor" more natural sounding?

Thanks,
JD