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[SlimDX] AudioBuffer garbage collection

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Just in case anyone else runs into this issue, I wanted to describe a problem that I ran into with XAudio2 in SlimDX. I am using looped AudioBuffers in a WPF app. When I started the audio, the tones would initially sound normal, but if I either started interacting with the app or waited for 15-30 seconds, they would start buzzing. On a hunch, I added a reference to the AudioBuffer that I was passing to my SourceVoices in a related object that I am keeping around. After doing so, the problem went away. I am assuming that the AudioBuffer was getting garbage collected in spite of the fact that the SourceVoice still needed it. I hope that this helps someone.

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