Available as an assembled Module and as a DIY project.
This Module is currently available.
Switch Between Eurorack A/B Signal Switches
This is available from an eBay seller in Lithuania, either as a Kit or fully assembled.
Description from the seller:
This is a 6 channel passive signal switcher wih A/B toggle switch and on/off button on each channel.
It can massively improve your patching routines.
Say you want to pass the signal to a different filter - patch the cable to the input and the outputs to each filter and just flip the switch! Want to cut the signal entirely? Just push the button and mute it.
Works with CV and audio signals.
Width: 13HP
Note: The creator is new, Module URL is to their webstore (opening soon).
(Products may be found currently by searching on eBay.)