How do you growl on the trombone?

Answer 1

One of the best ways to do this is by using a pixie mute. This is a small mute that fits into the bell. It helps to shave down the cork until the mute goes pretty much all the way into the bell. Used in conjuction with a plunger mute (an unused common toilet plunger will work), the pixie makes a pleasing growl and the sound effects are pretty much bullet proof. You are operating the Trombone, so whatever sound you produce will be your own creation. Just play around with the plunger. Try the wah-wah sound effect and the growl at the same time.