Quote:
Originally Posted by anthonyd
... Active Noise Cancellation (ANC) and Active Sound Enhancement (ASE). ...
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Just a guess, but ASE is possibly based on engine RPM and/or output and/or throttle pedal position. ANC may use the same microphone that the cell phone interface uses (or the same RPM/&c signals as ASE). If you find a good answer, please share the link.