What it means MIDI input is the stream of playing data that flows from a MIDI piano (or keyboard) into your computer — the notes you press, ready to be captured by software. In the channel's material it appears in a hands-on exploration: connect a MIDI piano to your computer, then have Codex build a small app that reads that input and shows you exactly what you're playing. How it is used here The workflow treats MIDI input as the raw signal that turns casual noodling into something you can explore and understand: - Connect the piano to the computer so its notes arrive as MIDI input. - Build a small app (with Codex) that displays what you're playing based on that input. - Explore further — the same pattern can be applied to any song, exercise, or technique you're curious about. - MIDI input = the note data a MIDI piano sends to your computer. - In this channel it's the foundation of a Codex-built app that visualizes your playing. - The pattern generalizes: any song, exercise, or technique you're curious about can be explored the same way.