Beep notifications intermittently working via RhoElements 2 on a 9200 beta

Using RhoElements as the browser on a MC9190 device (9200 beta unit) with CE 7.

We have beep notifications in our application using the sample code provided in the Motorola documentation, and the beeping works ocassionally, other times a very faint tap sound is heard instead. It fails to work more often than it works. I can't seem to isolate the cause nor a solution. Cold and hard reboots do not seem to resolve the issue, and sleep mode or power cycling doesn't seem to cause it. This is not occuring on our 9200 alpha unit with RhoElements 1. Is this a known issue?