Yamaha DTXpress/DTXplorer/DTXtreme

I have an older DTXPress kit, probably the first in the series. Don't
really know as I got them used from fellow drummer.  My problem is
that I have lost the ability to choke my crash from dual pad PCY80s. 
I had done a factory reset once and don't know if that caused it to go
away.

Anybody out there know how to restore choking ability??  Thanks

Len