(19 Feb 2015, 8:34 pm)MurdnunoC wrote At the risk of stealing Davey Bowyer's gimmick.
Mk1 National's went like this:
nnnnnggggghhhhhhhnnnnnnngggggggggggghhhhhhhhhhhnnnnnnnnnnnnnnnggggggggggggghhhhhhhhhhhhhhhh
Mk2 Nationals sounded like this:
uuummmmmooooommmmmmmuuuuuuuuuuummmmmmmmmmmmmmmmmmmmmmmmm
(Closest as I can get I'm afraid)
You are a genius!
At least that gives me an inkling. Judging by your, erm...sounds effects, Mk2s sound a bit like B10BLEs or DAFs to me.