Soundwise, the MC-303 really offers you jack. It's basically a sampler that can't have sounds added to it. For 303 sounds, go with any software suite. The only good use for the MC-303 I found is for sequencing in a live environment. Any sounds can be found on the net if you look around. In fact, in the new version of Sonar, there is a softsynth made by Roland that seems to have the same sounds as the MC-303.