Set modifier as selected track number???

Ok im trying to set a fader to control the volume of a selected track, but then offset it.
So lets say I have 8 faders and I select track #3. I want to control track 3-11 with my 8 faders incrementally.

The way I imagine to do this is with using modifiers to make the track number the faders control.
But I need to get the track number from a reaction.

So in my volume control it controls track m1,m2 etc etc for each of the faders up to m8. that way the track number controlled is the modifier. which im going to try to make “Selected track number+1”, “Selected track number+2” etc etc.

My listener right now is:
self.song().view.add_selected_track_listener

So it triggers whenever i select a new track.

then in the action I have “self.set_modifier_value(“m1″, [….])” as modifier to set the m1
This way im setting the modifier… i hope. I’m starting to get lost here.

And then I am kind of stuck on the output on the action to set the value to be equal to the track number. Especially since it seems to only output a range based on observation.
I’m looking around all over but there seems to be no track number.

It probably looks something like self.song().view.track_number. But I do not see that command in there anywhere.