Alesis Sample Pad 4 Compact Percussion InstrumentAdd Expressive Percussion to Your Setup Introducing the Alesis Sample Pad 4. Offers compact percussion and sample triggering capabilities with velocity sensitive pads. Expand Your Performance Add any sound sample to your drum or percussion setup via standard SD card In Demand Sound Built in library of the 25 most commonly requested percussion and electronic drum sounds mapped across 8 ready to play kits Designed for Maximum Creative Expression Four