Can someone tell me how to use this kind of stove ? Is it true that only works with metallic pots, since the top is flat, I must use flat bottom pots to get larger area of contact ? ) c, x/ H' j- M3 G . Y# d( Y: g9 Y; wAlso what's the difference between current model of Malata Karaoke player compare with earlier models 8 j9 w7 v6 e6 b5 {2 R" yThanks for help.