Bought ages ago, barely used. Was a custom job for another BC'er, works passively but if you use power then you can take advantage of the huge pink led on it (similar to a jewel sized light on an amp)
1 in 2 out, foot switch to select between them, simples
Standard MXR box sized
I found this from the original pm Maxx Tuner mute / A/B Box - As new. I had this custom made for me by www.electrick-garage.com with a GIANT, BRIGHT, FLAMBOYANT PINK LED... I later applied the glittery Pink Pather as it put a smile on my face, although it can easily be removed if it's not to your liking.
£25ono
Cheers