VSN1 - Buttons and Rotary Dial

I an using my VSN1 to control functions on my Ketron EVM arranger module. Configuring buttons with relevant Midi cc or sysex codes to trigger functions is not my issue.

What want to do is use a button to select a feature and then use the dial to scroll up/down through whatever I’ve selected.

I have programmed the dial with NRPN so when i turn the dial i can see output in the midi monitor but the dial is not working properly.

Rotating the dial the values go from 1 to 0 only in one direction - what I’m expecting to see is rotate one way and the output is 1 and rotate the other way and the output is 0 which would equate to up or down when i scroll on the hardware EVM module.

What am I doing wrong ? appreciate any help.