Baby steps, even though I have made this, my first Ardour export:
I have used the wrong version of the drumkit plugin.
That’s why the drums do not have a separate mixer slider yet.
Used the lolly pops in the piano roll. The drum kit reacts to how hard you hit a drum, hi hat and so on.
Finally something that works as I expected. Select a note drag the lolly pop.
I failed at changing the velocity in that other way. (horizontal bar in the note)
I also downloaded dragon fly reverb. Will be interesting if I can get close to the original version, which has a lot of echo, probably reverb.
With separate sliders, I also know how to add a plugin to a mix channel.