"Mark" writes:

3. What change would you expect to hear as a result of this phase
shift if the content was, say, human
speech?

Listen for yourself:

http://www.uspsdata.org/OurHouse90.wav
--

I think I heard a change in the stereo image indicating you changed the
phase of one channel relative to the other, correct?

Yup - happens about halfway through the clip.
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%%%% % *Time*, Electric Light Orchestra
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