BOSS Slow Gear SG-1 guitar effect circuit. With above circuit diagram, you can build the BOSS Slow Gear device by yourself and no need to pay a lot for this circuit.
The SG-1 filters out the attack of your note, and swells the volume automatically. There are only 2 controls, one for the attack speed, and the other for sensitivity. The attack knob controls the speed of the volume swells. A compressor or overdrive in front of it may be helpful to minimize the variations in your signal level for the SG-1’s response. Used with a delay it sounds sort of like a more articulated E-bow or a passage played backwards.