Eventide Time Factor
Eventide has finally gotten into the business of making gear for working musicians and the results are impressive. The Time Factor supports stereo or mono I/O with a guitar boost switch on the input and attenuate switch for amps on the output. Three buttons allow you to select presets, mute the effect or tap in delays in real time. A large LED dot display makes it easy to see the selected program or parameter even in low light (not so great in sunlight) and 10 seperate adjust knobs provide you with an amazing level of configurability.

Check out the users guide and Quick Reference Guide for more info. The FAQ page is very good as well.