Hey there Eric, I am yet to do Synthetic vs Sympathetic but the essence of it is: is your leadpipe sound Sympathetic i.e. free, loose and in response to the the reflecting pressure wave OR Synthetic i.e. pinched, manipulated, artificial.

I am going to do a video going through the entire “Dispelling Brass Playing Myths” presentation. It is on the vast list! But don’t panic, all of the information is covered here in the course.

Best Wishes,
Greg