Let’s get one thing straight: DrumSpillage is not a virtual modeling Roland 808 or 909. I don’t doubt you could come close with some careful programming, but that is not what this plug-in is about.
DrumSpillage is all about drumsynthesis. It’s got sixteen drumpads, that can be played by clicking them or via midi. Drumkits are assembled by choosing a drumsynthesis model for every pad and edditing the sound according to taste. Every model is specially designed to create a certain type of drumsound like a bassdrum, a snare or a hihat. Because these models are build from components that every synthesist will recognize, like oscillators, filters, envelopes and lfo’s it’s not hard to start programming these models right from the start.