Buy this pedal. It's as simple as that. I'm fully impressed with this little rocker pedal. Like most people, I've only used it as a volume pedal, but I plan on doing a fully video review later on when I try it with some delay to see how the expression side works. The instructions on how to use the expression function are a bit lacking; you need to connect it directly to your controlled pedal using a stereo cable. The circuit reads it as expression function automatically. So, for the details... Line in, line out...no surprises there. The shell is plastic, but it's a very high quality impact plastic. It runs passively, so no power source is necessary; it's a simple volume pot on a rocker switch. Yes, it's tiny, but it has a great traction pad on the top and bottom so it doesn't slide around like you think it might. And it's perfectly comfortable to control. As a volume pedal I've used it both in-line and through the FX loop, and it's aweso...