The RAAF Roulettes are able to be heard on 133.900MHz,
Australia wide at the many events they attend.

I must thank Luke for the information below:
Luke heard the roulettes on 123.450MHz, in the Point Cook area.
On this frequency you were able to hear everything, from when they turned
on the smoke, or dived, even when they made a mistake.
Luke was also able to hear them when they turned to 126.200 on
approach for landing at Point Cook.