Gerrard Bevin has released RouteMIDI, available as a FREE Open Source download.
RouteMIDI is a multi-platform command-line tool that makes it very easy to connect MIDI ports together, passing MIDI messages between them while filtering, transforming and converting them along the way.
All the heavy lifting is done by the wonderful JUCE library.
RouteMIDI is the third member of a family of command-line MIDI tools, alongside SendMIDI (send MIDI messages) and ReceiveMIDI (receive and monitor MIDI messages). It deliberately shares their concise command vocabulary, number and note-name parsing, and JavaScript scripting, so if you know one of them, you already know most of RouteMIDI.
RouteMIDI turns your computer into a flexible MIDI patchbay. It connects one or more MIDI input ports to one or more MIDI output ports, and lets you decide exactly which messages flow through and how they are modified on the way. Typical uses are merging and splitting ports, remapping channels, transposing a keyboard, scaling velocities, filtering out clock or aftertouch, or running arbitrary JavaScript on each message.
It can also be driven programmatically. RouteMIDI publishes a machine-readable command schema (--schema json) and includes a built-in Model Context Protocol server (--mcp), so scripts and AI assistants can discover the commands, start routes, and inspect or live-edit them while they run; see AI.md.
For more information on RouteMIDI, click here:
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