MixConsole strange volume slider behavior

I am using only one VST (Halion Sonic)
I have set 3 instruments to channels 1-2-3 of Halion sonic (say piano, guitar, violin)
I have created 3 midi tracks in my project, connected to Halion Sonic at channels 1-2-3

Problem: in MixConsole, if I move any of the sliders of any midi track then the whole sound of all tracks is affected! If for example I low down to zero the slider of the piano track, then there is no sound. The sliders of the rest of the midi tracks remain at their position, but there is no sound coming out

Why is this happening?
Each midi track listens to different midi channel

Hello, you should not touch that fader. To adjust the volumes you must go to the instrument itself (Halion Sonic SE) and adjust it to the internal channel itself.

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There is a mixer section in Halion Sonic

Oh? Why so? Why should I never touch it? Why does it exists then?
Yes I am aware of the Halions mixer and things work well this way
Thank you anyway🙂