Lehle Julian Boost Pedal HZ/LZ switch lets you select input impedance TS/TB selector switch allows you to select the bypass mode you want Multiple LEDs to display your switching state Gain, Frequency, Boost and Treble controls Since these boosters had a very low input impedance we have equipped the Lehle Julian with a switch that reduces the impedance from 1 MOhm to 10 kOhm for authentic rendition of their characteristics