Analog Four mkII in Split Mode

Elektron Gear Analog Keys/Four
#1

Hi Guys,

I’m using my A4MKII in split mode. I’m trying to set the pitch bend parameters but it doesn’t receive any signal. Do you know if that’s a limit of the machine or i’m doing something wrong?
Midi ch for split mode: 8
function mode: int. trig
The external keyboard that i’m using is a Roland A-300PRO.

Thanks