●9VDC INPUT：As with most pedals, the Expressio takes a standard center negative power supply.
●BLEND KNOB : Use this knob to control the amount of saturation you'd like on your effect.
●INPUT JACK : Connect your cable into this input from instrument or other sound source.
●OUTPUT JACK：After using the Expressio, run a cable out of this jack to go to your next desired amp or effect.
●OUT TO LOOP(SEND)：This output will run to desired effect you wish to use with the Expressio.
●IN FROM LOOP(RETURN)：The output of the effect will run back into this input.
●POLARITY SWITCH：In case of phase cancelation, use this switch to reverse polarity
●BJF BUFFERSWITCH：Use the switch to control whether or not you'd like the BJF buffer circuit used.
●EXPRESSION PEDAL INPUT：When an expression pedal is connected into this input the knob control is bypassed and saturation control is only controlled by the connected expression pedal.
●FOOT SWITCH：turn on or off the Expressio.
dimensions : L 11cm, W 6cm, H 5.5cm
weight : .24KG
input impedance : 100K ohm
output impedance : 100 ohm