Syntax

send(data)
send(data, timestamp)

Parameters

data

A sequence of one or more valid MIDI messages. Each entry represents a single byte of data.

timestamp Optional

A DOMHighResTimestamp with the time in milliseconds when the message should be sent (relative to Performance.timeOrigin).

Return value

None (undefined).

Exceptions

TypeError

Thrown if data is not a valid sequence, or does not contain a valid MIDI message.

NotAllowedError DOMException

Thrown if data is a system exclusive message, and the MIDIAccess did not enable exclusive access.

InvalidStateError DOMException

Thrown if the port is disconnected.

Examples

In the following example a middle C note is sent immediately, followed by a note off message one second later.

function sendMiddleC(midiAccess, portID) {
  const noteOnMessage = [0x90, 60, 0x7f]; // Note on middle C, full velocity
  const output = midiAccess.outputs.get(portID);
  output.send(noteOnMessage); // Omitting the timestamp means send immediately.
  output.send([0x80, 60, 0x40], window.performance.now() + 1000.0); // timestamp = now + 1000ms.
}

Specifications

Browser compatibility