You can put 5 classes of samples in this directory: Samples starting with: "Base-", "Breakbeat-", "Clap-", "Hihat-", "Snare-" are randomly chosen. The breakbeat samples' playing periods are automatically adjusted to the bpm speed used. They'll just have to be finetuned once the way you would like them to be. The breakbeat-samples should always be FOUR beats in length.