By "buffered", I think you mean that you want to ensure that (a) the audio driver's buffer of data never gets empty and (b) the audio stream over the network stays well ahead of the data being played through the speaker. You can go a long way toward (b) by waiting until you have several seconds' worth of data available before you start writing data to the audio driver. (a) may or may not be harder; I don't know enough about audio drivers.
On a related topic, you may benefit from boosting the scheduling priority of your program.
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