Electro-Harmonix Memory Man TT 550msThe Blend control allows you to vary the mix of direct and delayed signals, and the center position setting equals out both levels. Feedback provides delay repeats, or multiple echoes. Fairly high feedback with short delay settings produces a reverb effect. The Delay control determines the time between direct and delayed signals, and between the repeats when feedback is used. Strange, eerie, and unusual pitch shift effects can be produced by changing