I have had those leading-edge audio thumps since the beginning of my QMX (v27 FW) as well and wondered if it was going to be fixed but it doesn't even look as though its on the list to get fixed. To me it's a big problem and would welcome a software change rather than hardware fix. I will post a YouTube video demonstrating the symptom when I have a chance.
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Myron WV?H
WV0H