I am in the process of selling my GP 500 and a potential buyer asked me about rhythm capabilities. Apparently, they have been working with a strictly electronic piano while exploring "bossa nova" type music. To my knowledge, the Grand Hybrid does not possess a specific rhythm or "beat box". I read that one could add an independent rhythm device to the GP through the "input" port. Any insight on that possibility? Also, could a person feasibly use a beatbox app through a tablet and connect that to this type of piano? I welcome your opinions.