Yeah... no criticism implied. SMF's have their uses exactly the same as style play. It was just hearing those counter-lines without seeing them played that made me think it wasn't an arranger demo.
I also use a few 3rd party SMF's, and do the same as you. I'll heavily edit them to my liking, and strip as much as humanly possible from them to give me the most to play. After all, why should the sequencer have all the fun!
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An arranger is just a tool. What matters is what you build with it..!