Multi-Expression Controller Connect an expression pedal with up to three expression-capable effects and control them individually or at the same time, Each channel is individually programmable so you can set...

"Lehle Mono Volume 90, volume pedal, In- and output jacks on the side, ideal for pedal steel players, operates wear-free with precision magnetic sensor - without mechanical potentiometer, from -92 dB (mute) to 0 dB..."