Mlrv mapping

I am using mlrv with a monome 256. Im using six rows, but want to use the bottom half to control the faders. Is it possible to map one fader to a vertical line of 8 buttons?

is it possible to map a particular number value to the transposition tab? at the moment ive used the 9th button along the 0th row but it just seems to send 12 or -12 on release?