No Fris B., the Dart. I don't recall anything that distinctive with the Allison, and just how many times did you hear a Merlin in your working day?
Who can recall the joys of "taxying by ear" in the Friendship? Power up to 11,000 rpm, release the brakes as you slowly advanced the levers until you just heard the props bite then, once you'd reached a reasonable taxi speed, slightly retard the levers until you heard the props go back into Ground Fine.
I was recently given a DVD made from a 1970's video of F.27's on the ramp at Tullamarine - the visuals were wonderful but it was the sounds that made me break out in goosebumps...