Hi, how do you increase and decrease the volume effect on a given pedal? For example, I want to use the Mel 9 selectively for the intro of a song, but not the entire song, and then use it again for an outro portion. If I stomp on the button, it is a harsh break. I want a smooth transition. Do I need a volume pedal for this? I would be too difficult to reach down to lower the volume on the pedal itself. I am beginner, so just trying to figure this out. Thanks for your suggestions.