No info about availability.
Analog Switch Module
The EMW AUDIO SWITCH 201 module is an audio-rate switch that can be used in numerous ways. The audio signals in INPUT A and INPUT B appears on the OUT connector as a function of the CLOCK input. When the Clock input is low (0V) the signal entering INPUT A is connected to the output. When the Clock input is in high state (> 2.5V.) the signal entering INPUT B is presented on the OUT connector.
http://www.electronicmusicworks.com/eurorack/audio-switch-201.html