A volume pedal equipped with a precise magnetic sensor enabling it to operate almost wear-free. This sensor uses the Hall effect, named after Edwin Hall, to measure the strength of magnetic fields. In the Lehle Stereo Volume, the Hall sensor, which is made in Germany, is accurately calibrated to the built-in magnet and the control range of the pedal. A premium Blackmer Stereo-VCA (= Voltage Controlled Amplifier) from the United States replaces here in this case the mechanical potentiometer. The principle of the voltage-controlled amplifier is based on the fact that gain can be varied by the control voltage coming from the Hall sensor.

Over the entire control range the Lehle Stereo Volume transmits the full sound spectrum of the connected instrument. Internally, the input voltage coming from the power supply socket of the pedal is rectified, then filtered, stabilized and doubled to 18V, thus achieving a total dynamic range of 110 dB.The volume control of the Lehle Stereo Volume ranges from -92 dB to 0 dB - so from a virtually muted level to the same volume. The Lehle Stereo Volume can both distribute one signal to two outputs and add up two input signals to one output: If only a mono signal is supplied, the signal can be split and sent to two different output channels using the split-function. An input stereo or a dual-mono-signal can be merged to mono via the summing function.