When I use the Prefs in the Extras draw to adjust the alarm volume to zero, then back to a different volume, the volume on the entire MessagePad gets muted. The Newton device then will not allow me adjust the volume, even though I change the setting in the Extras drawer.
This is a problem with the Alarm volume setting. The workaround is to turn the MessagePad off and back on. Next, open the Extras drawer and adjust the volume. The sound should return.