Pilots personal accounts from shed loads of reports and books, too many to mention.. in particular with Hurri's and Spits with Merlins, the engine noise was extremely loud, even with flying helmets on, and remember, they didn't have the noise cancelling helmets that are available now, plus, why do you think the BBMF pilots all wear modern helmets?
MG and cannon fire could be plainly heard inside the cockpit, along with effects from the recoil from the guns.
As to pilots mentioning hearing approaching aircraft, well, I can't remember reading anything about that aspect..
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