Unfortunately, this is no longer available, but perhaps the Related offers may be of interest.
huendeskes My programmable effect switcher footswitch in nice condition is for sale. It can control 8 effects, one of which you can connect to the effect loop, and it also has two trigger inputs to switch your multi-channel pedals or your amp's channels and reverb. This allows, for example, your amp's clean channel, plus chorus, delay, reverb, etc., to sound with one footswitch, and then when a distorted solo comes and you need to switch quickly, with another switch, the mentioned effects turn off and simultaneously your amp switches to the distorted channel, or to your distortion pedal and booster pedal, etc. It has a mute function for tuning and a tuner output. A total of 24 presets can be saved, which I think would be enough even for Steve Vai. There is no latency during switching; as soon as you step on it, it switches, and there's no "pop noise" when you step on it. It's a very good piece of gear. I'm selling it because I'm switching to a Gec9; meanwhile, my modulation effects that need to be connected to the effect loop have multiplied, and the 1 slot is no longer enough.