Silverlight MediaStreamSource AudioBufferLength

Having end-users who've toyed with my emulator randomly complaining about sound pops or skips, I decided to sick a slider which would allow them ot set the AudioBufferLength of the MediaStreamSource which generates the sound..   However, it doesn't seem to affect the stream in real time.  Hmm, I don't want to have to tear down and recreate the audio in real time, if avoidable.  I wonder if there's a solution out there?  Anybody?