This Module is currently available.
Pan/Fade
The Q111 Pan/Fade module can pan an input signal between two outputs, or fade an output signal between two inputs.
For example: Pan mode would allow a single input signal to be routed to one of two different speakers. Fade mode allows an output to fade from one of two input signals. Both Pan and Fade modes allow manual and voltage control.
These merchants probably sell this module. Huh?