Feature:
There are very few features. It has a knob that lets you set the max volume and you can control the volume for 2 instruments or left and right simulatanously. It runs on 9V battery or 12V AC adapter - here is where the problem lays. I can't find a 12V AC adapter that works. Radio Shack no longer carries a multi-tap adapter. You have to buy the adapter that fits it and they tried them all and said none of their's works. Which is amazing considering that they have almost 50 different sizes at least.

Value:
Would pay more if it included the 12V AC Adapter.

Desirability:
It's a volume pedal.

Sound:
The product does work as a keyboard volume pedal, however there is definitely a hum associated with it. While playing it is not noticable, but is when no one is playing.

Ease of Use:
It is easy to use except when you have to change the 9V battery. If you don't unplug the pedal after each use, your battery will be dead. I wish Behringer sold a 12V AC adapter, but they only make a 9V one.

Support:
Haven't had to use yet.