I doubt its a latency problem, but here is what the DPC thing looks like after about 5-10 minutes of doing what its doing.
Test interval: 1000us
Current latency: 180-218 (Keeps changing.)
Absolute maximum: 306us
"This machine should be able to handle real-time streaming of audio and/or video data without drop-outs."
Here is a download to a recording of my mic doing this.
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