The TABY Is our Toggle-switch-based passive ABY switch. A small toggle-based switch, wired for A-Y-B switching. It can be used as 2-in-1-out, or 1-in-2-out.  As it is passive, there is no buffer or signal/status lights.
This does ground the unused Jack, and has two toggle jacks: One to select between Y or OR, the other while in OR mode selects A or B. This can be used as an instrument switcher too, but with the grounded behavior works great for A/B/Y'ing output signals to multiple amps.
The overall dimensions are: