Adam,
I put in what you request, so when the reminder happens the sound byte will play the number of times specified in your reminder form. However, I'm not sure what the advantage is to having the alert sound multiple times. I agree with Derek's concept. I did this in one of my client's applications. I put in a reminder system and whenever a reminder happens a popup form is displayed with a sound. The user sees what the reminder message is and they have the option to either close the reminder out or set another reminder for a specified timeframe like 15 minutes or an hour, two hours, next day or whatever they desire. They don't have to go back to the original task reminder form to update it. You might want to consider that design.
Also, I hid the Play Once checkbox and the Loop checkbox in the reminder setup form. It is confusing if you are playing a sound a set number of times.