[PD] MIDI controller question

I have a feeling this question is more general than specific to a piece of hardware, so here goes...

Has anyone tried using a Peavey 1600x MIDI controller with PD? I sucessfully mapped all the sliders using "ctlin". Each slider has a velocity range, and the same MIDI channel, and they each have a different "number".

However, below each slider (on the peavey), there is a button. I've programmed each button to "toggle" between two "strings" The problem is, the peavey represents "strings" with HEX notation.

I've checked all the peavey documentation... Is there a certain way that PD recognizes MIDI/HEX data, so that I could have each button toggle between, say, 0 and 1, and thusly trigger a toggle button?

I hope I explained that properly?! ;)

STEVE