The Electro-Harmonix Deluxe Memory Man has been a staple on pedalboards for over 30 years, famous for its organic analog delay and modulation. With the Electro-Harmonix Deluxe Memory Man 550-TT (the 550 stands for its maximum delay time, by the way), you get some modern perks added to this classic. The 550-TT comes with five Tap Tempo subdivisions, true bypass, four expression modes, and an FX Loop that allows you to insert effects into your wet signal.