#1
hey can anyone help me i got a digitech whammy from USA n im in Austalia and i dont no what wattage/volts converter to get?
#2
internationally, pedals are the same. if you use batteries, they're fine.

the digitech site should have a list of compatible adaptors, but if not, go to your local guitar shop. theyll know which one to give you. either that or you could get a Voodoo Lab Pedal Power 2+. those things are pretty awesome.
Pedal GAS?
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#3
what you need is a [Australia voltage] to 9V AC 1000mA or 1A

it has to be AC for it to work, 1300mA or 1500mA would work too. Try looking in an electronics store or ebay for these!