The Péter Somos MIDI Grooves Software is an electronic download expansion pack for Hertz Drums from Hertz Instruments. Featuring broken grooves or grooves in odd meters. This invaluable collection of drum grooves contains 520 grooves in time signatures such as 5/4, 7/4, 8/4, 9/4, 10/4, 11/8, and 19/16. Add this pack to your arsenal, and bring a twist to your rock/metal compositions. This expansion pack requires Hertz Drums / Drums Lite.