have successfully imitated the growl (by this I mean a continuing rasp
in a note from beginning to end -
Fairly easy to produce if you can do a uvular "R" in your throat as
you play both blow and draw. I learned from the record by John
Sebastian Sr. - Profile - where he uses it to imitate the trumpet in
Gershwin's American in Paris. A draw rapid tongue trill also works
on the draw but not so well on the blow.