Hi Nigel,
I just loaded the demo for the style _GAMBLIN.STY, which contains 3211, and it played fine for me. It's a great harmonica sound.
Does the track that you have RT 3211 loaded on have "double-time" set by any chance. When I set "double time" in Realtrack Picker for 3211 in _GAMBLIN.STY, it did not sound too good. Maybe something like this has happened.
Regards,
Noel