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I am noticing some cross-talk between the headphone output and the line in. Using a FFT program there are harmonics of the headphone fundamental audio tone seen on the input. I guess I noticed this before when I was running the audioInjector-test.sh script when I had no cables connecting the line out to in. The FFT display there looked exactly like it should with the cables connected as shown in the setup info forum post here. When I unplug the headset, the cross-talk is reduced maybe 10dB.
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