Waylon Jennings 1970's Maestro PS 1A Phase Shifter with foot switch, this was used live and on recordings.Think the "Dukes of Hazard", "Mammas Don't let your babies grow up to cowboys" thats what this effect is. It works and sounds good. This was obtained from Waylon Jennings personal collection. Comes with documentation. Please see auctions for more Waylon Jennings items.