I have been in search of such a device to no avail. I want to be able to kill my loop (typically full of od/dist/fuzz and delay) and have them trail off. I emailed Geoff @ Barge Concepts about a possible mod for my VFB-2 to install a kill on my loop's send to eliminate creating more chaos and allowing the sound to decay on it's own. What other options are there? Any modders have any clue as to how difficult it would be to add trails to a buffered loop (as in my VFB-2) with a switch or some other means? I suppose I should pose that question to Geoff as well. I'll let you know what I find out.