I'm selling my 3Leaf Audio Chromatron Filter. I'm the original owner and received it late 2018. I've taken it out of my basement twice. It's in excellent condition and works perfectly. There is velcro on the bottom. From 3Leaf's web site: The Chromatron is the result of 10 years tweaking, refining and reimagining the state variable filter circuit. It is an optically-controlled analog filter that can switch between envelope control and manual control via expression pedal with the push of a button. The envelope detector is an original design, producing a musical filter response that spans a broad range of tones from vintage quack to future-synth psychedelica. I'm selling it for $300 via PayPal which includes fees, shipping and insurance. No trades.