First thing I do after booting is to assign Fill2, Fill4, Auto Fill, Reintro & especially Harmonizer on/off to the user assignable buttons. However, regardless of what I do, these revert back to default when I next reboot. Can anyone help please?

Once assigned (with the USER ASSIGNABLE still flashing denoting EDIT mode), press the SAVE button. "Save Seting" is periodically displayed on your screen. Then press EXIT to return to default screen (make sure USER ASSIGNED is turned off). Now to have this setting automatically recalled whenever you power on your AUDYA, press SAVE - CUSTOM START UP (F6), otherwise the factory settings will be recalled.