They ain't much for natural sounds. Mostly synth stuff and drums. Lots of misc sounds that you could use to fill up the foundation of a track, guitars are nice too and perc. For instruments though you really don't want 1 shot samples that change in length as you play it across the keyboard. You need either soundfonts or a good vst instrument like proteus x, dimension pro, sonik synth 2. For free go to the soundfont sites and get soundfonts and get SFZ for a free SF player.