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 ? ( x- `' Z& }0 c2 j " x+ C& l6 a) }' yAlso what's the difference between current model of Malata Karaoke player compare with earlier models 2 d% U V4 l! C3 ?% y5 O/ cThanks for help.