I set an alarm on a task item. Had my Treo 650 set to vibrate only. The alarm went off on the phone, but no vibration to alert me. The Treo screen turned on with the "Clear, Snooze, Go To" buttons, but no indication that the alarm had gone off other than the screen turning on. If I set the switch on top of the treo to audible alerts, the alarm sounds.

Is there a way to get task items to alarm via vibrate?