Hi everyone, i can't decide which product i will buy. - wk 7500 has pattern sequencer - cdp 220r is a digital piano but i has many keyboard abilities. My problem is that: i want to create my auto accompaniment style (my rhytms) but i don't know how i can do it easily. wk 7500 includes this option (pattern sequencer i can be wrong because i am an amateur) I don't understands midi program's logics they looks too complicated for me, but if i do it via keyboard it could be easy if i fix this problem i want to buy cdp because of it is piano. if i don't fix i will buy wk 7500 i am waiting for your advice...