A MidiDeviceProvider is a factory or provider for a particular type
of MIDI device. This mechanism allows the implementation to determine how
resources are managed in the creation and management of a device.

A MidiFileReader supplies MIDI file-reading services. Classes
implementing this interface can parse the format information from one or more
types of MIDI file, and can produce a Sequence object from files of
these types.

A MidiFileWriter supplies MIDI file-writing services. Classes that
implement this interface can write one or more types of MIDI file from a
Sequence object.

A SoundbankReader supplies soundbank file-reading services. Concrete
subclasses of SoundbankReader parse a given soundbank file, producing
a Soundbank object that can be loaded into a
Synthesizer.