I think this is referring to the Midi note number. See page 20 of the Reference Guide. Try changing the Midi note number for the offending pad - see page 19 1.6 "Note Number".
Glad to hear you are still using the kit. I am afraid I haven't been active drumming for a while, although I did have a spell with the guitar (unsuccessfully).
I will have a photograph on the St Catherine's Hospsice Callendar next year for June though!