Question: I want to make a rocket 'whooooooooooooooooooosh' sound that can go on FOREVER. I have the sound I like, I just need some protips on making it loop. I've been hacking away at it in Pro Tools, and when I loop it in there, it works, but when I implement it in the game I'm working on, there's a clear loop point. Any idea how I could remedy this? I also saw the Rabbit Ears Audio rocket pack, which would be like, perfect for what I'm doing. If you were taking a sound from a library, what would you do to it to make it something that could loop?

Answer: 
hmm... maybe there's a way to combine it with a Shepard tone so the doppler is "continuous" (assuming our perspective is fixed from outside the rocket) 

<http://en.wikipedia.org/wiki/Shepard_tone>
surely the way is to seperate construction of the events

the doppler effect is most noticeable when it passes the listener,
so from launch, to close passby, to close away use Michaels awesome rocket sound

then 

1. make the constant rocket engine sound
(like you have a mic gaffer-taped to the side of the rocket)
2. apply the doppler via a very long/slow LFO'd filter of the constant rocket sound!
it would take some matching.... and some epic verb!
but who is going to check that it actually goes on FOREVER?
(could you ask them to also check my perpetual motion machine while they are at it?)