The Roland SP series refers to a line of portable sampling and performance instruments designed for musicians and DJs. These devices allow users to create, manipulate, and play back audio samples in real-time, making them ideal for live performances and studio work. The SP series is known for its user-friendly interface and versatile features, including effects processing and looping capabilities. One of the popular models in the Roland SP series is the SP-404SX, which offers a range of built-in sounds and effects. Musicians can easily record their own samples, edit them, and trigger them using pads. This flexibility makes the Roland SP an essential tool for creative expression in various music genres.