To other currencies? Ex:
I have a code for 200 EURO. I want to redeem it into USD.
I have the option checked in settings so this should be done automatically right?
I think that settings is referring to new deposits involving banking. I'm thinking loading a EUR redeemable code adds funds to your EUR wallet on Mt. Gox. If you then want USDs, you buy bitcoins on the BTC/EUR and then sell bitcoins on the BTC/USD market. The fee is less than what Mt. Gox charges to withdraw EUR as USD to a bank, I believe.