Nice!
But where I was impressed was by this!
DB-601 Engine sound simulator
for electric R/C planes
Awesome
And this is how the sound system looks like:
300US$ for a sound system is a bit on the heavy side but, I decided BEFORE I spend money on a TrackIR5 (in order to get rid of this stupid "no gunsight" side view on the Bf109), I will buy one of these and connect it to my throttle