Compact unit. Easily mounted to an existing setup. Expandable memory and extra trigger inputs. The Alesis SamplePad 4 is perfect for home production small gigs and adding an array of electronic sounds to your acoustic setup. Featuring four pads the Alesis SamplePad 4 has 10 built-in kits and 25 preset sounds. Thats great for getting set up and playing quickly. However it also accepts up to 32GB of SD card storage space allowing you to store an additional 89 user kits and 512 samples per card. So you can have all of your essential sounds ready to play wherever you are. With USB/MIDI connectivity you can also hook the SamplePad 4 up to your own VST and recording software. Perfect for producing music in your home studio. You can also add the Alesis Multipad clamp for integrating the Samplepad with your drum kit.