hei
did u read that document of Reason? recommending you read it carefully,before playing. that u can get realizing how to us those rack models. READ CAREFULLY,pls.
u should understand how to using the racks and THEN u can be known how to arranging rhythm. for REASON, rhythm is only for drums! it's for all GROOVY sound or even non-groovy sound, if you're smart enough.
i think you're that smart one.