The Jamstik is a MIDI controller at its core. This means that the device outputs MIDI messages to the receiving device and software, such as the Jamstik app or an app like GarageBand, and translates these codes into sounds. To get started with your Jamstik, please read the Getting Started Overview.
In addition to standard guitar sounds, there is a large variety of other sounds available in many MIDI-based apps and Software. Check out Apps That Are Compatible With The Jamstik+