Rudi - that's pretty cool, didn't realize the sound engine was capable of that :)
A couple of things - it doesn't seem to loop indefinitely for me. Sometimes it stops after four or five loops, sometimes after one - it's pretty random. In order for it to start going again, I have to press the stop button and then start button again.
Also, I'd personally switch up left and right clicking for the volume controls. To me, it seems like left should make the knob turn counterclockwise, and right clockwise. It would be cool if you could incorporate some sort of click and drag on the dials as well.
Nice start :)