MIDI Loader ⚡🅡🅞🅣🅘

The pack's whole pitch is "Everything-Reactivity" - nodes that respond to audio, MIDI, motion, and more - and this is the entry point for the MIDI half of that. It loads a .mid file and trims it to a specific measure/beat range, ready to feed into whatever MIDI-driven feature extraction the rest of the pack builds on top of.

How it works

Pick a file from the dropdown, optionally narrow it to a specific range of measures and beats, and it outputs a MIDI object. This node doesn't do anything with the MIDI data beyond loading and trimming - turning notes into a reactive FEATURE signal (something a Flex node can actually modulate a parameter with) is a separate step elsewhere in the pack.

The inputs and outputs that matter

• midi_file (required, enum) - the dropdown lists whatever .mid files are available to the node; the pack ships a handful of samples out of the box (a couple of "promiscuous"-themed test files, plus a generic sample_midi.mid). Like other ComfyUI loader nodes, this dropdown reflects a folder ComfyUI watches for that file type - drop your own MIDI file in and it should show up after a refresh.
• track_selection (required) - the schema shows all as the available choice, i.e. by default you're loading every track in the file rather than isolating one instrument.
• start_measure / start_beat (default 1 each) and end_measure / end_beat (end_measure default 0, meaning "all remaining measures"; end_beat default 1) - the trim window. Leave end_measure at 0 to just play through to the end of the file.
• Output - a single MIDI object, for whatever downstream node in this pack extracts a reactive feature from it.

How to install it

Via ComfyUI Manager: search "RyanOnTheInside," install, restart. Manually:

cd ComfyUI/custom_nodes
git clone https://github.com/ryanontheinside/ComfyUI_RyanOnTheInside.git
cd ComfyUI_RyanOnTheInside
pip install -r requirements.txt

then restart ComfyUI. No model downloads for this node - it's parsing a standard MIDI file format, not running inference.

Common issues & troubleshooting

Your own MIDI file doesn't show up in the dropdown. ComfyUI loader dropdowns are populated from disk at load time in general, so a file added after ComfyUI started won't appear until you refresh the node (right-click → refresh, or restart ComfyUI) - this is standard behavior across loader-style nodes, not specific to this one.

Trimmed range doesn't match what you expected to hear. start_measure/start_beat and end_measure/end_beat are two separate coordinates, not one continuous timestamp - double check both pairs are set consistently, and remember end_measure: 0 means "don't cut the end at all," which can surprise you if you expected 0 to mean "nothing."

Only certain tracks matter but track_selection only offers "all." As of this pack's current schema, per-track isolation isn't exposed here - if you need to isolate a specific instrument track, that's either a job for your MIDI file itself (export just that track before loading) or for whatever downstream node processes the loaded MIDI object, not something this loader controls.