Reminder sound doesn't repeat?

[jkoch]

I moved to the Treo from an old Nokia 6800. That little phone was the best at bugging you to no end when you had a reminder set... It would beep for a full minute or so, progressively louder, forcing you to pay attention to it. The Treo, in contrast, is disappointing. I can't get my Reminder sound to repeat, even though there's a checkbox in the Notifications control panel that says quite plainly "repeat". Am I missing something here, or is this checkbox a dud?