The Line 6 DL4 Delay Stompbox Modeler is the first stompbox to give you digitally modeled effects. Includes 16 vintage delay and echo effects including Tube Echoplex, Space Echo, Deluxe Memory Man, Analog Delay, Reverse, and many more. It also provides for 3 programmable presets and an onboard Tap Tempo control, 14 seconds of sample-loop memory, true bypass switching, an expression-pedal input for realtime control of all effects settings, and stereo inputs and outputs. Runs for up to 30 hours on four C batteries or with the included power adaptor. FREE SHIPPING! Here is a link to the owners manual:  https://line6.com/data/l/c0a8090beeaa404f9983ba3f6/application/pdf/DL4%20User%20Manual%20-%20English.pdf