Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great pedal when it works

This volume pedal is a great size for most pedalboards and fits great on mine. It has two settings for swell rates (one is a linear rate, one is more parabolic in its shape). The only reason I knock it down a star is because I've ordered this from Amazon and it cut out when it was at 0% volume. I returned that one and got a next-day replacement (well done, Amazon!), but that one cut out at 100% on the parabolic taper setting. I switched it to the linear swell and that worked correctly, but it essentially kills the resale value if I ever get rid of it. All in all, the pedal is definitely the one to get - I'm just questioning whether or not it's worth buying a pedal that can't be tested until it's received.