Craig! said:Straight cut gears can give the same noise, plus a whine.
To make this magic 'race effect' sound Mike wants I suggest draining at least half the gearbox oil out of the 'box - this will encourage the 'rally sound' whine
To emulate the Dog box sound I would imagine doing away with the normal clutch surface, and replace with some interlocking nuts bolted through the flywheel to really engage with the gearbox.
OR
when driving along make a eeeeeeeeeeeee noise that gets louder with engine speed, then when you move the gear lever shout 'clunk'
eeeeeeeeEEEEEEE-CLUNK-eeeeeeeeeeeeeeEEEEEEEEEE-CLUNK-eeeeeeeeeeeeeeeeeeeEEEEEEE-CLUNK-ee
as they all sound like that (i mean with the clunking and "wooshy wooshy")