There's an answer to question 3, if someone else will want to know:
You can use
Code:
oscsend(oscOut, "f/action/@/cc/soft", msg3/127, 1);
command, where "@" is an action number.
Action number for track 1 volume is 20, track 2 is 28 and so on.
You can controls volume, panorama, mutes, solo, fx bypass and record arm via actions from 20 to 27 for the first track.
There are actions for 99 tracks available.
Thanks to goldenarpharazon, who suggested this solution.