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The Toppobrillo Mixiplexer or "mixing multiplexer", is a unique hybrid signal routing device that marries the idea
and design of a quad-panner with a 4-channel crossfader, otherwise known as an "interpolating scanner"; a flexible 4-to-1
and/or 1-to-4 voltage-controllable "switch" with an adjustable linear cross-fade between channels.
possible applications include source location or "position" control in a multi-channel setup, timbre mixing
or "morphing" between sources, "soft" (ie. pop-free) switching, nonlinear wave-shaping techniques, and programming.

the Mixiplexer is all analog, and has been designed with audio in mind-(though is DC coupled) employing high quality low-noise VCAs throughout,
with excellent channel separation and gain matching from channel to channel.
"off" is really "off" (-100dB) and "on" is never greater than unity gain.

many combinations of input/ output routing are possible

http://www.toppobrillo.com/mixiplexer.html

• ? mA +12V
• ? mA -12V
• ? mA 5V

No info about availability.