I'm using JABB with Finale 2010, and the trumpet and trombone mutes load fine, with the exception of the plunger. Even the plunger with straight mute loads okay, but the plunger alone sounds just like an open trumpet or bone. Now I know that there are some plunger samples in this thing somewhere! They just aren't loading for some reason.
After creating notation expressions that indicated CC#16 settings (1 - 127), I still was getting no sound. So I checked the sample window again, an, lo and behold, the mod wheel on both the trumpet and bone mutes was set to 0 (or 1 or whatever). Since the mod wheel controls the volume, more or less, setting these to 64 did the trick. Thanks.