Lehle Mono Volume

The Lehle Mono Volume is a wear-free volume pedal with a high-precision magnetic sensor. This sensor uses the Hall effect, discovered by Edwin Hall, to measure the strength of a magnetic field. The Lehle Mono Volume's Hall sensor is made in Germany and precisely calibrated to the built-in magnet and to the stroke of the rocker plate. The platter simply moves the magnet, whose distance is measured by the Hall sensor, which in turn controls a VCA (Voltage Controlled Amplifier). Manufactured in the USA, the high-quality Blackmer VCA replaces the mechanical potentiometer. The principle of the voltage-controlled amplifier is based on the fact that amplification varies according to the voltage coming from the Hall sensor. This is far more precise than the mechanical potentiometer or optical sensor of conventional volume pedals, and eliminates potentiometer noise and the need for time-consuming calibration. The Lehle Mono Volume reproduces the full range of instrument frequencies over the entire pedal travel. Input and output impedances always remain identical. So there's no high-frequency attenuation effect as with a potentiometer. Inside the pedal, the supply voltage is rectified, filtered, stabilized and then doubled to 18 volts. As a result, the pedal is extremely resilient at all levels, achieving 110 dB of dynamic range. The volume variation applied by the Lehle Mono Volume ranges from -92 to 0 dB, i.e. from almost nothing to unity volume. A potentiometer can be used to add amplification of around +10 dB. The Lehle Mono Volume operates very quietly and evenly, as it features low-friction plain bearings made of high-quality polymer to eliminate mechanical transmissions from the platter to other components. An adjusting screw makes it possible to fine-tune the platter's resistance. The Lehle Mono Volume also features a direct output with buffer amp. This can be used to feed a tuner, a CAM system or a second amp without coloring the sound.