Yamaha DTXpress/DTXplorer/DTXtreme

Hi all,

I use BFD as a drum synth, and found that the DTXPress III does not 
send the assigned MIDI note of a choke (on crash cymbal) to my 
sequencer (Sonar).
I know I can set up which note to transmit in the Voice setup, but no 
matter what I change it to for the choke - I can HEAR the choking when 
playing with the sound of the DTXPress III but it keeps sending the 
same note as when hitting the crash cymbal).
Isn't this a bug - and if it has been corrected (say by a new firmware) 
how would I install this new firmware?

Sincerely,
Dennis P