Error Check (parallel Octaves, fifths and what-not), Automated inversions (retrograde etc.), Record music while you play

Error Check - A spell checker for music

Automatic Inversions - I wish to inverse a passage I've written. This is merely a time saver. The ad-on exists already but I'd like to see it in trunk.

Record Play - It's as though it would be nice to see it be able to predict note values. Could lead to spontaneous creations.

Thank you for your time.

P.