i just had one that i sold. and yea it hummed too. the sound board is unique to jokerz, it's stereo! wow. it practically is a dataeast. i sold it for about $800, all ready to go, plug and play, cleaned up and all working. well not quite, one score display (lower) was a bit wacky. the new owner bought a rottendog score display. probably a good move. to me that price is really cheap, given what it is. I mean it's a multi-ball ramp game with interesting rules. you would think it would be worth a lot more...