I needed to use the KeyMidi Extra but I couldn't figure out why I wasn't getting any sound in my project. I foolishly realized that I wasn't in the range of midi. I decided to add the following features:
Clips to the range of midi.
Shows what octave you're in.
Tells you when you need to go up or down if you're out of range.
Simple features that might save you the embarrassment I endured.
Midi only allows 127 notes(10 octaves). If you were using the AU DLS Synth, the KeyMidi originally would just allow you to go over that range. You could go hypothetically, 100 octaves up or down and you wouldn't be able to hear anything and had no way to know where you were. It was an annoyance for me when i was testing a patch out. so I changed it. I hope that makes sense.