Apple Logic Pro /LogicExpress Discussion

I am having a problem whereby, as I play through a project, the levels in the Mixing 
 window will fluctuate uncontrollably on their own.  So I will start a track and have a certain 
 recorded layer (it seems to be only happenning with MIDI, not Audio tracks), say, at -4.2, 
 in the middle of the song the level will fluctuate--always upward, so one level will get 
 incredibly loud--without me having any control.  If I try to re-adjust the level to what I 
 want, Logic takes on a mind of its own and continues to push the level up.
 
 My friend has told me this is a real-time track automation thing; that I have done 
 something during the initial recording process so that auto-mixing is a function Logic is 
 taking onto itself.  What can I do to reverse this? What window do I need to have up and 
 what do I need to press so that I am not having this problem?
 
I occasionly have had similair problems(?) To say it simply: go to the event window and remove any volume(cntlr#7) messages .In short you are probably experiencing a conflict between the two types of automation.