The #1 Echo is part of the Electro-Harmonix line of Micro (xo) guitar effect pedals, with a small die-cast housing. But don't let the size deceive you - it produces some of the finest digital echo available, with a full two seconds(!) of maximum delay time. Echo/delay effect is controlled by feedback and delay time knobs. A blend control lets you adjust the amount of delay in your signal to make sure the Micro #1 sits exactly where you want it in any track or performance.