Diagnose a missing MIDI signal one step at a time

When MIDI disappears, find the first point where the signal stops. Avoid changing several settings at once.

1. Instrument: is it powered and configured to send MIDI?
2. Connection: is the cable a data cable, connected to the correct port or interface?
3. Computer: does the device connection remain stable?
4. Browser: is MIDI supported and permission allowed?
5. Local classroom: does one played note appear on your own display?
6. Peer: after local input works, can the other participant see it?

If reconnecting fixes the issue, test several notes before resuming. If not, record the instrument model, browser, connection type and exact point of failure for support.

MIDI carries note messages rather than microphone audio. Hearing the instrument in the call does not prove MIDI is connected.

For browser requirements, consult the MDN Web MIDI guidance. For instrument-specific ports and drivers, use its manufacturer’s documentation.

Follow the complete signal-path guide.