Have a look in the midi Options settings and un-check the Midi Drums and RealCharts check boxes.
You could add that to the script to un-check them, I think it's already un-checks the midi chord markers = TCheckBox1
TCheckBox2 = Midi Drums
TCheckBox3 = RealCharts

or just go into midi options and set it, but you need to save a midi first so it will save the settings.




If you download AHK SimpleSpy comes in handy: