I'm looking for a volume pedal that lets through no signal at all in heel down, and preferably doesn't affect tone across the entire audio range. I'd be using it to operate swells from an always on tabletop drone synth which will be run through my bass rig. I want to be able to blend it all the way out rather than turn it off/on by hand. I have almost no experience with volume pedals but I gather that some let a little signal through when in heel down. Also other recommendations are welcome if you know of a mixer or blender that allows hands free exp pedal operation and can blend a channel out entirely.