[Trombone-l] quick! what's a "jazz mute" ?

[Ray Horton]

Quick! Rehearsal tomorrow morning for Bernstein's _Divertimento for 
Orchestra_:

What does he mean in the 7th movement by a "jazz mute" ?  He's already 
asked for a "brassy mute."  There are no + or o indications, etc. 


The passage for "jazz mute" is "slow blues tempo" 12/8 and is low and 
loud. 


Thanks for any help


Raymond Horton
Bass Trombonist
Louisville Orchestra