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[banjo]

I am fairly new to computer music and have just spent my hard earned on a Yamaha SW1000XG audio card for my G3 300 320MB ram 6GB + ext 1GB hard drive set up.
I have been experimenting with ProTools Free software (before purchasing the audio card) and found it extremely easy to use.
Can anybody tell me if there is any reasonably priced software that has the ease of use of ProTools that will work with the audio card. I have been looking at Cubasis VST 2.0 for mac but cannot find a demo, apart from the full version demo (is it similar?).
I basically want a package that will enable me to use both midi and audio (input for voice and guitar) to compose a soundtrack for a childrens musical that my wife is writing.
Any help would be appreciated.

Thanks