I purchased this thing originally to be used as an expression pedal. It is supposed to be a stereo volume pedal and a dual expression pedal. What I don't like about it is the expression pedal option is virtually useless. The main issue is the volume "jumps" from 0 to around 25 before continuing up, thus making it useless for "swells" or control of any parameter. I have tried this on my computer audio programs, hardware synths and even my KORG TR and my KORG X5DR. The problem persists on all of them. What I do like is that it has a nice metal chassis and stereo audio inputs. I have read that some people think there is signal degradation from this unit but I have not noticed any myself. There is also a feature that lets you adjust the range of the pedal with a little knob on the right and also a physical screw option that does the same thing. I don't really use either option but they are neat features none the less. I paid around $90 for this unit used, it goes around $125 new. Had the expression option worked, it would be worth every penny, but if you are just looking for a stereo volume pedal, I would spend my money on a stereo Ernie Ball pedal. Same concept but less money. As I mentioned earlier, I have read a review before that stated there was some signal degradation but I haven't noticed. It sounds clean and clear to me. I own an Ernie Ball mono volume pedal. They are pretty much the same quality in my opinion. No, I wouldn't buy this one again. The fact that the expression option is useless, even on other KORG products, I do not recommend this pedal. The volume pedal option works fine but there is no reason to pass up a stereo Ernie ball pedal for $20 less.