The Small Stone is one of the coolest phasers made. In 2005 they now come with true bypass, but the volume is cut a little when ON, while you usually want it at least as loud when ON. Our mod sets the volume the same, and includes an internal trim pot so you can set the volume just where you want it. We also put a second trim pot inside to control the FEEDBACK when you have the COLOR switch up. If left alone, the pedal will feedback and whistle when the volume is increased. This allows reducing the feedback to keep the sound OK. It also allows you to make the COLOR UP sound closer to the sound of the COLOR DOWN sound if you don't like it to be so crazy. Or if you want the whistling feedback you can dial some in.