Boss FV-500Hchat_bubble_outlineFrom real comments

The Boss FV-500H is a high-impedance volume and expression pedal for guitarists. One user asked whether the volume taper is smooth enough to create a cello-like swell, noting that some pedals still have a slight edge so the sound comes in too fast at the start of the sweep. Another user reported a much more abrupt taper in practice: from heel down to about 30% toe engagement, volume changed roughly 0-90%, creating a drastic peak and drop rather than a gradual adjustment. That user could not find a fix for this behavior anywhere. They noted the issue only appeared when the pedal was placed at the front of the effects chain, not at the end, suggesting position in the signal chain affects the volume curve.