The Roland SRX-10 Big Brass Ensemble is a hardware sound expansion board for Roland synthesizers. It features a collection of brass and wind instrument sounds, including trumpets, trombones, saxophones, flutes, and other instruments. It also includes a variety of orchestral and ensemble sounds, such as strings, brass, and woodwinds. The SRX-10 is compatible with a range of Roland synthesizers, including the Fantom-X, JV-1080, XP-30, XP-50, XP-60, XP-80, XV-5080, and XV-88.