Thanks Ed,
Another point, there are some features that are both audio and MIDI not included in that list, such as RealCharts.
These give you the notation (MIDI) of the RealTracks (audio) performances.

This is a good educational tool, since you can hear exactly what a professional is playing (and how they are playing it), and see the MIDI notation on-screen, and on the on-screen guitar/bass fretboard or piano keyboard.

For example, a student who wanted to learn an alto sax solo for a certain song, can type in the changes, generate a RealTracks solo, and a RealChart (MIDI notation) that they can print out and study. And now they can Freeze that performance so they can revisit that same solo.
They can hear how the musician is interpreting the notes, so that they can learn that too, not just copy the notes. To me, that's a good feature for teachers and students. Some people asking for more MIDI features are requesting this because they are teachers etc., hopefuly they aren't completely overlooking RealCharts in this regard.

Have Fun!
Peter Gannon
PG Music Inc.