Diki, as Bill mentioned the mod wheel is the default setting of B4 fast/slow Leslie..It is assignable to any other button..

Al , yes I would have loved a 76 key controller with the same options as this X board 61...
The other choices were 88 keys that weighed more than my G70....or other 88 key controllers that limited to a single zone and no frills..

There are some nice 76 controllers that are expensive, with nice features, but again weigh as much as the G70[and the G70 would win hands down]..

This EMU, has a great semi weighted touch with after touch and 4 zones..These were my main concerns

BTW: I couldn't hear the soft spoken sales person, and ended up purchasing a 24 month extended, replacement warranty ($15 option}..But since I got a great buy, I didn't mind the option..