How do I select which track in ARIA Player is affected by the Pan and Volume controls on my MIDI Controller?

I have a MIDI keyboard that has controllers for Pan and Volume. It send these on Channel 1 (though I can change that). When I turn the dials, the Pan and Volume controls in ARIA Player's mixer move. 

However, they only move for ONE of the tracks, and I cannot alter it. NOT Channel 1, or whatever channel I send. Not the currently selected instrument, either! Currently, I'm sending on MIDI channel 1, but track 3 is moving in ARIA. 

In fact, with two instances of ARIA Player running, different tracks are moving in each one!

In Logic, for example, the Pan and Volume moves for the currently selected instrument, which is what I want. (Even though I'm always sending on Channel 1 and the instrument is on another channel.)