Thanks People!!
Glad you like it.
Rikki, I use a few audio loops recycled and sound fantastic! the problem is (in order to donīt sound repetitive) they extend for 16 bars (each for every percussion instrument) so it takes a LOT of memory (my merengue takes 280 megs only the percussion, my salsa 380megs...) In order to preserve memory, I try to use internal bass and drums but they donīt mix well at all and sounded too weird, I donīt know why. I try to do it with internal sounds but Tyros4 perc and drums still thin and hollow.
Also, Iīm afraid of ram (even if it is flash). It fails at the worst time!!