Hi
Using just the style you first tried : _BOSAMEP.STY style : with no other work on the song
I can enter AmMaj7 no problem .
When I use it over a number of bars the style plays notes based on that chord depending what it is doing it may or may not play the MaJ 7 or any other particular note from that chord ,
As you can see if you look at the notation for the Piano, (as this is the only track that we need look at as the other two are bass and drums.)
If it adds the Maj 7th above or below or at all, depends on where it is going next . So it not like a held chord that you will always hear all the notes,
Hope this helps
Mike

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