Had to go on a 35 mile run once, we started off with the yelp but it drove us crazy so switched to wail but that started to put us to sleep (it was around 2AM) so we ended up running without a siren except when needing to clear traffic! My left ear is a little short on hearing, too many gun-shots B-M (before 'muffs!
By the way, nice models, brings back memories.