I'm referring to the old Keytars of the 80s, and the new AX-7 from Roland. I'm going to audition for an 80s cover band, and besides that, I'd like to use my keyboard skills in other situations. I'm thinking a keytar can be a practical way to fill that void. What I'd like to know is: 1) Are they heavy? 2) Do they play well with other MIDI devices? 3) How difficult is it to get used to playing it? 4) Does the keytar have any advantage over a regular keyboard? 5) Any other advice or tips? Thanks in advance.