MIDI Quantizer

MIDI Quantizer is a software router and pitch quantizer for MIDI devices and events. This app accepts input from a single MIDI device and routes it to up to four MIDI devices. For example, send input from a MIDI keyboard or sequencer to multiple hardware devices or multiple channels on one or more devices.

The quantizer function allows you to select a musical key signature and shift all input notes to the nearest note which is part of the selected key. Other options allow you to offset input notes by pitch or time or volume, for example to create chords from a single input note, or to echo input.

A free trial version limits some functionality and should be useful in determining whether the application supports your interests and your environment. The full version adds keyboard splitting, saving/loading presets and assigning friendly names to MIDI devices.