I did the mod with P5 and P6, 2 switches. Was easy to do and worked well. I took it out and intend to put a viagra b kit in. I do not like the mish-mash of channels scattered here and there with this switch this way and that switch that way, grab your partner swing her around oops, where'd she go, OH!, there's no channel there its back to channel 33. . .
Does work, but does not get 40 up, and 40 down.