Hi John, interesting finding. Due to my experience with those noisily tubes I guessed it would have instantly died. Maybe on a very late point I give it a try, but no real planning to do so.
EDIT: After further consideration I wonder if a turbocharger turbine can also be considered as normally driven in a "pulsed" mode? E.g. a 4 stroke 4 cylinder engine driven at (lets say) 5000 rpm would (depending on the crankshaft) create a more or less pulsed exhaust stream with a frequency of 333hz.
I’m much more interested in the resulting thrust (and fuel consumption) of the controlled valve version.