The Mooer MEP-SE Slow Engine cuts off the attack of each note and produces and effect like rolling up the volume knob on the guitar or that of a bowed instrument. The Slow Engine has two controls. With the Attack knob you can control the speed of the volume swells and with the Sense knob the amount of the effect. Used with delay can create some interesting backwards sounding passages. The pedal switching is true Bypass, so the sonic integrity of your instrument is never lost.
Mooer Slow Engine Micro Guitar Effects Pedal