How do you add sidechain inputs to instances?

I was wondering how you get surge’s vocoder to work

^ This is what I read

I can’t work out how to make new input side chain connections though. It shows 2 audio inputs for the instance in the article. But I got none.

Screenshot_20210330_141049 Screenshot_20210330_140937

I connected up the mic anyways in picture 1, no sound is played when playing keyboard unless I bypass all the FX. But I need the vocoder. What to do?

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The plugin has no audio inputs. My guess is you are running it on a MIDI bus?