Unless the C1 has 4 inputs you are limited to doing a mono Left and Right kind of pseudo ducking. Put the signal you want to duck in the left channel, put the trigger signal in the right at a louder volume so it triggers the threshold before the left signal then route the left output to your mix and not the right.
Some of Voxengo's plugs have 4 inputs so you can duck stereo signals. The C1 is a pretty old plugin.
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