Calendar Notifications as Alarms
I tried Alarm Calendar Plus, but it didn't seem to work properly.
https://play.google.com/store/apps/details?id=com.moyou.acplus&amp;hl=en

I'm now using the premium version of Business Calendar, which allows you to set the notification to repeat many times, and snooze the notification.  I think it still uses the notification volume, but is serving my purpose.
http://www.businesscalendar.de/