Dorico mixer

I am engraving string quartets. Why does the mixer show 4 MIDI instruments but only one channel for NotePerformer? I would have thought there would be four, so that they can be individually FX’d etc. Why does it show only Violin 1?

It has to do with Noteperformer, which uses its own internal mixer and only sends the Final stereo bus over to Dorico.
Click on the e next to NP ok play mode to access it. Effect possibilities are very limited though.

I see. Drat. Thanks for the explanation.