The AMT Legend Amps F1 is a basic guitar preamp that uses analog JFET circuitry to mimic the sound of traditional tube amplifiers, and can be used with other Legend Amps models to build a multi-channel preamp. The F1 has a clean channel, and can route signal to an auxiliary effect via the footswitch. It features low, mid and high frequency adjustment, as well as level, master volume and gain controls, and a bi-modal speaker cab simulator.