I’m sorry, it is impossible to disable the MSB and LSB midi data sending.
Program Change
Operation:【SHIFT】D1【Program Change】【Set value】【ENTER】
MIDI message sent:CC#0 + CC#32 + Program

If you try to use DATA Dial to quick choice a voice.
Rotate the data dial to find the voice# them press the【ENTER】button the send the MIDI data, or press the【EXIT】button to cancel the operation.

If you have any furture problem, you can contact me by wma@centrmus.com.