The part is 'only' the keyboard with which you control your PC/Mac via USB. The PC/Mac then makes the crack or the music... depending on your skills. The software and Babel to the PC are included, but you have to connect it to an amplifier or speakers yourself.
I've been playing on and off for a few weeks and have never had this problem. But after 30 minutes of unuse, it sounds really bad for you. I'm sure that's not normal. I've never had a problem with point 2 with any key. That's my experience.