Typically the object sending the messages is a Transmitter associated with a hardware input port, and the port relays MIDI data that it gets from an external instrument. Similarly, to record music, a series of time-stamped MidiMessages are generally sent to a Receiver owned by a Sequencer, which places them in a Sequence object. The device that owns this Receiver might be a Synthesizer, which will generate audio directly, or it might be a MIDI output port, which transmits MIDI data through a physical cable to some external piece of equipment. To play music, a device generally receives MidiMessages through a Receiver, which in turn has usually received them from a Transmitter that belongs to a Sequencer. Transmitting and Receiving MIDI Messages explained that devices typically have Receiver objects, Transmitter objects, or both.
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