valraven aralis

I was wondering when you open a MIDI file in FLStudio 7.0 is it supposed to only give the Piano Roll and the MIDI Syth and no sound. When I copy and paste the piano roll to a "in house" FLStudio syth or a Sytrus Syth it plays perfectly assuming i got the instruments right. It isn't a big problem, it's just that with some MIDI files they don't show the instuments at all and it's a pain to have to listen and decipher every instument used.