MidiSystem
Totorial  FullExample   Play Note Sample ● MidiSystem Tutorial readMIDI1   
Old Sample   MIDI File Formats MIDIRead/Write  StandardMIDIFile  
There are 3 different "Types" (sometimes called "Formats") of MIDI files. 
A Type 0 file contains only one track, and all of the MIDI messages (ie, the entire performance) are placed in that one track, 
    even if this represents many musical parts upon different MIDI channels.
A Type 1 file separates each musical part upon its own track The data is split to tracks based upon the channel data.
A Type 2 file, which is extremely rare, is akin to a collection of Type 0 files all crammed into one MIDI file. 
Type 2 is used to store a collection of songs or patterns, for example, numerous drum beats.
Writing MIDI   write(seq,1,File) FileTypesList 
MIDI Notes  0=C Octave-1  24=C0/Octave0 36=C1/Octave1 48=C2/Octave2   108=C7/Octave7   
Arpeggio  GuitarArp GuitarChords 
MIDI Pan via CC10 Controler?   PianoKeys 
MIDI Device   MIDI Programming 
channel = synthesizer.getChannels()[9];
...
channel.controlChange (10,0); // pan left
channel.noteOn (35, 64);
channel.controlChange (10,127); // pan right
channel.noteOn (36, 64);
 

Hierarchy:
Sequence  Sequence 
Track
Events: Events with time Tick 
MIDI Instruments GS-List(MIDI_Intr.txt)  BankSelect(CC32)   Bank Bank2 MIDI Cmd    
Synthesizer: A device for generating sound. It's the only object in the javax.sound.midi package that produces audio data
MIDIDevice detection JavaGervill   
JavaSample1  
MIDIEvent ShortMessage  MetaMessage Types MetaProcess MIDI Commands Cmd2