A couple of observations.
The nose-down approach of the old piston airliners was a product of the Kermode classic "transport" wing profile with only trailing edge flaps. The nose-up jet attitude is achieved with leading-edge slat/flap. The transition is personified, IMHO, in the Comet. In the L-1049, with full flap, approach attitude is typically -5deg, transitioning [should it be achieved] to about +5deg as the wheels touch approaching the stall [85kt at MLW/Flap 100%.] For what it's worth, it feels as though you're about to have a tail-strike then the wheels touch smoothly; quite unnerving to today's jet pilots!!
Likewise the Connie engine sound is a by-product of the power recovery turbines [PRT's] sucking the exhaust energy out of every 6 cylinders. This dampens the sound as evidenced by the contrasting sound of a re-engined (Sea) Fury with the R-3350 from the Skyraider.
G'day
