This thing's real cool. It's real old. Pot dates to end of 1975. Looks like it's been through a bit, but works fine, no noise, etc. Sounds great. Great phase sounds. great range. In addition, if you turn it all the way up and it's got a weird warble. like a 'space" effect. Back then I used the 2 knob green Boss one. Now, a P90. This one is different. Gets almost to Vibe land if you want. Color switch is not a toggle, it's an old style plastic switch. My drummer son's country comedy singer friend saw it in a neighbors garbage. Gave it to me as he doesn't need such a thing. Anyone ever use one of these?