The MOTIONAL PAD on GAIA-2 operates as a pointing device while displaying the SOUND or MENU screens to select items or specify values. (Factory default)
If you want to use the MOTIONAL PAD only for tone control instead of as a pointing device on the SOUND and MENU screens, set the MOTIONAL PAD UI Sw to OFF.
[MENU] > System > Ctrl > Motional Pad UI Sw