Thank you for your prompt reply, GloomyAndy.
I believe that I understand what you're saying about the PDM (I read that part and shook my head... I would love to have an DtoA converter instead as I'm more familiar with those - I understand the reasoning behind using something less expensive, though). If I am reading your message right, Lejos does not currently have the capability of adjusting the PDM fluctuation sent to the speaker; this is handled internally. If I am incorrect in this, please let me know.
A little more about the project: I am trying to stream ~10 - 30 seconds of music (8 bit wav file sampled at at least 8000 samples per second) to the brick from the PC. Unfortunately, the RAM won't hold that amount of data all at one time, so I needed some way of concurrently playing the sounds, deleting played portions of the sound, and transferring unplayed portions of the sound file to the Brick. I've looked into the BT transfer speeds described here and I think that I can make it work speedwise, but getting the threads to play nice may be another issue entirely.
If there is a way to adjust the PDM bit using Lejos, please let me know and I will experiment with it. If you can think of any other way to allow me to successfully play (audible) 30 second sound files without trying to find a workaround, also let me know.
Again, thank you for your time. Getting the opportunity to discuss technical issues with the people who actually create the software and the documentation sure trumps trying to guess how it works on my own