“This unique pedal allows you to play two different chorus effects simultaneously. The effect has speed and width controls for each side and inverted stereo outs. It was made for only one year way back in 1985.”
“Pedal can be used mono or stereo. Separate speed and band width
controls for each output, allowing two separate settings to be played at
one time, through the same amp, or through two separate amps.”
More information on this effect can be found here.