Always In Key

Select a musical key and restrict the MIDI output to only notes in that key

Xmidi Always In Key

Always In Key is a small utility app that allows a user to select a musical key and restrict the MIDI output to only notes contained in that key. (For example, in the key of C Major, no sharps or flat will be played). When a "bad" note is received (i.e. a note outside the selected key), the user can configure AIK to either ignore the note or play an adjacent note.