Hi Ted
I have used Noteworthy Composer for the last twenty years. It does far more than I have use for,including composing scores from scratch. The thing I find awkward with the SX900 is that you work from a small display that shows whatever channel you choose,but usually no chords,and the signature has to to set for each registration,to avoid unnecessary accidentals. It works for some,but I have too many to foll with.

Composer reads the entire score by default,showing you every part. You press part to choose Fakebook,melody staff,and all parts except drums to get your chords. Then all you have to do is go to set up and mute the highlighted melody part. You now have a good quality fake sheet that scrolls with chords,through the song. You save it as a Notation file,and it always comes up as you saved it,with no adjustments necessary.

Of coarse,it being Midi,and in need of a soundset,you have choices. I have midi'd the laptop to the keyboard with an interface to use the SX900 GM sounds,and it works fairly well,usually. I usually keep it separate so I don't pick up strange sounds,and use the built in softsynth,which is default. It is better than the old windows GM soundset,but you can get better with some other soft synths or an SD2 module,eg.

The Composer is $99 downloadable,and the Musician with fewer features is cheaper.

I think it is great,myself.

Bernie