Thanks everyone. There's an awfuly lot of tone generators out there. I tried the 2 suggested ones out however I couldn't find a funtion to allow me to do a batch save. Was I doing something wrong?
I'm a lazy git really as I'm after something like this - choose a wave or combination of waves - set a high and low frequency value - set amount of steps - press a button and it saves the file at certain steps as wav or aiff. Or basically something like that. I can't really see it being that hard for the programmers to add something like that however I get the impression it's a feature that not alot of people need. I'm tempted to post up here
http://www.rentacoder.com/ and see if anyone will do it for ?5
Anyway, if anyone can point me in the direction of something like that floating about then I'll be a happy man.