Ryan,
If you aren't hearing the squeal it's because you don't have enough throw. Try setting up the ail for 35 - 40 deg on high and try an axial roll by burying the stick, It should squeal like a freight train then

I let a buddy of mine try her this weekend and he did awsome 4pts on low and got a nice squeal out of "my" aircraft LOL. On low rates, I can't even get it to sound like that on low rates, I also think it's how agressive you are and the speed of airplane. Chirp, chirp, chirp, chirp smoooth and crisp. Nice.

Also I saw 40%ers squealing doing the wall. I think you need significant spoileron to do that though.
RickP