I've got to be one of the few guys that differs with most about the sound of a 4-stroke.

I agree that single cyl 4-strokes sound better than small 2-strokes, & work particularly well in scale light planes & planes that have radials in real life. They don't sound that great in a warbird that has a V-12 in real life (Mustang, Spit, P-40, P-39, P-38 etc.) There is too much single-cyl put-put-put sound that's not even close to a V-12. In my opinion, large 2-strokes (both gas & glo) have an exhaust note that is much closer to a V-12 warbird.