ndcMIDI v1.30
A pack of MIDI utility plugins I made to use with Tracktion's Rack Filters (though they'll probably work in most hosts). Scroll down for download links. (C++)
MIDI Note Filter

Allows through only the selected note.
MIDI Note Trans

Transposes all incoming note values by the specified amount (irrespective of key).
MIDI Channel Filter

Only allows through MIDI messages from the specified channel. Useful for doing global transpositions (see readme).
MIDI Velocity Amp

Amplifies/attenuates incoming velocity signals.
MIDI Channeliser

Forces all incoming signals to the specified channel.
MIDI Force2Key

Forces all incoming notes to a key specified by the user. Also allows for transposition within the key.
MIDI Note Range Filter

Only lets through the specified range of notes.
MIDI CC Range Filter

Only lets through the specified range of cc values.
MIDI Velocity Range Filter

Only lets through the specified range of Velocity values.
Download Windows VST (420kB)
Download OS X VST (ppc only) (1.87MB)
Note: No source code; I lost it in a hard drive failure.