But when I listen to QS-300 demo songs they sound unbeliveable. It must be a way to achieve that greatness of sounds.

And there is also another problem. If I load a MIDI song onto my QS-300 I can't select XG sound. Only GM sound are available in both, in TG-B and in normal mode. I was trying to fix this using syste exclusive messages GM-RESET, XG-RESET but nothing works. Dammn.

Can anybody help me?

BTW: Thanks for your previus answer Xenon.