If you want to learn piano/keys.. imho it is best to explore it yourself. I don't think learning from a book helps one bit, will probably hold you back in the long run. Best to experiment and see what it can do, esp with keys/piano as it is such a visual instrument. It kind of depends what u want to get out of it. Personally I went from synths to piano without much trouble so I am not sure a piano weighted keyboard is that essential when you start out, especially with the expense. Enjoy, let me know how u get on!
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