The An-22 really does make an extraordinarly deep growling noise - first time I heard it, I thought it might be an AN-12 out of Heathrow at 8000 or so - it was the 22 vapour trailling along Green 1 at 29000 plus! Second time, down around 15000 inbound Bournemouth, and rattling my windows and filings! Wonderful...
The AN-12 is quite resonant and fairly umistakable, but 'tis as nothing...!