Engine noise was audible but the speech was perfectly clear.

The mike (or mic, as it for some reason is now spelled) on an aircraft
headset has a remarkable ability to filter out engine noise. While a
Continental 65 hp is nothing like a Lancaster engine, it is close to
the pilot and loud enough to deafen him over time, and to make
conversation very difficult. With a headset there is no audible engine
noise. (There's no push-to-talk on the intercom, so the mike in effect
is hot at all times.)

all the best -- Dan Ford
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