Super-Saturated Tape Echo Pedal with Mod Switch, Delay, Sustain and Volume Controls. GAUSS TAPE ECHO features a highly responsive and easy to use 3-knob interface with control over delay Time, Sustain and Volume. Our custom-designed, cutting-edge tape algorithm lets you create powerful subsonic pitch dives and self-oscillating spirals of psychedelia by simply manipulating the knobs in real time. An onboard Mod-switch lets you go clean, or add subtly natural and warm modulation to your echoes.