CONTROL_CHANGES that work for csc220 assn3.

https://anotherproducer.com/online-tools-for-musicians/midi-cc-list/

7 adjusts volume 0..127 and is already in use in program.

8 is stereo balance, also in use in class Professor. (0 is left, 64 middle of speakers, 127 is right).

1 is modulation wheel.

93 is chorus.

Those are the only ones that sound in the current OpenJDK Java library.

Use them (Professor already does), but pick your own instrument (PROGRAM_CHANGE) that works well
with your selected CONTROL_CHANGEs from the above list.

If you feel like putting in the effort, try playing two or more notes at a time.
Make sure NOTE_OFF is called for each note. An alternative to NOTE_OFF for each
NOTE_ON is CONTROL_CHANGE 123 that turns off all notes. Test to be sure. See below.

ADDED AFTER SOME EXPERIMENTS:

Professor's move() function never used NOTE_OFF. It could get away with that because
the handout Professor is using a percussive PROGRAM_CHANGE that dies away without NOTE_OFF.

When I changed my instrument to 16 which is a sustaining organ, it never quieted down.
Therefore, I CHANGED THIS PART OF HANDOUT PROFESSOR'S move():

    if (colliders.size() > 0) {
      sendMIDI(ShortMessage.PROGRAM_CHANGE, channel, instrument, 0);
      sendMIDI(ShortMessage.PROGRAM_CHANGE, channel, instrument, 0);
      int volumeAdjust = 7 ;
      sendMIDI(ShortMessage.CONTROL_CHANGE, channel, volumeAdjust, 127);
      int balanceControl = 8 ;
      int balanceLocation = int(constrain(map(myx, 0, width, 0, 127),0,127));  // 64 is centered in stereo field
      sendMIDI(ShortMessage.CONTROL_CHANGE, channel, balanceControl, balanceLocation);
      sendMIDI(ShortMessage.NOTE_ON, channel, mypitch, 127);
      // See http://midi.teragonaudio.com/tech/midispec.htm
    }

TO THIS:

    if (colliders.size() > 0) {
      sendMIDI(ShortMessage.PROGRAM_CHANGE, channel, instrument, 0);
      // sendMIDI(ShortMessage.PROGRAM_CHANGE, channel, instrument, 0);
      int volumeAdjust = 7 ;
      sendMIDI(ShortMessage.CONTROL_CHANGE, channel, volumeAdjust, 48);
      int balanceControl = 8 ;
      int balanceLocation = int(constrain(map(myx, 0, width, 0, 127),0,127));  // 64 is centered in stereo field
      sendMIDI(ShortMessage.CONTROL_CHANGE, channel, balanceControl, balanceLocation);
      sendMIDI(ShortMessage.NOTE_ON, channel, mypitch, 48);
      sendMIDI(ShortMessage.NOTE_ON, channel, mypitch+4, 48);
      sendMIDI(ShortMessage.NOTE_ON, channel, mypitch+5, 48);
      sendMIDI(ShortMessage.NOTE_ON, channel, mypitch+7, 48);
      lastNoteOn = getMilliseconds();
      // See http://midi.teragonaudio.com/tech/midispec.htm
    } else if ((getMilliseconds() - lastNoteOn) > 5000) {  // note has been playing 5 secs
      sendMIDI(ShortMessage.CONTROL_CHANGE, channel, 123, 0); // all notes off!
      lastNoteOn = getMilliseconds();
    }

That required adding another data field in the object's fields in the class declarations.
This is not a local variable inside a function. 

  long lastNoteOn = 0 ;

STUDENT REQUIREMENT 3b and 3c are now deprecated because with the current javax.sound.midi
library there are no additional CONTROL_CHANGE effects not already in use. Instead,
experiment with multiple NOTE_ON at the same time on different pitches, and/or multiple
instrument voice on different channels. See channels note below.

    // 3b. Add a CONTROL_CHANGE MIDI effect that you can hear, see
    // http://midi.teragonaudio.com/tech/midispec.htm and experiment with ConcentricCirclesInterval sketch.
    // Take a listen to modulation wheel (controller 1) and chorus (controller 93) Note that unlike the
    // instrument numbers, these start at 0, i.e., mod wheel is 1, bank select is 0. Make it a mapped
    // function of y location relative to [0, height-1] or another avatar varying variable.
    // 3c. Add a second CONTROL_CHANGE MIDI effect that you can hear. Make it a mapped function
    // of z location relative to minimumZ and maximumZ or anotehr avara varying variable.

Handout says this which now changes:

// Your Avatar MUST use channel 10 (I am using 0 and 1 and reserving the others),
// a range of instruments away from my 106 and its neighbors...

You may also use channel 11 or 12 or both for different instruments. 
If you use them in a single avatar object, just plug values 10 or 11 or 12 into the
channel parameter for PROGRAM_CHANGE, CONTROL_CHANGE, NOTE_ON, NOTE_OFF
messages. Or you could have different avatar objects play different instruments on 
different channels. When I test assignments I will 1) listen for audible changes
on instrument(s) different than mine, and 2) make sure the implosion of spheres is
perceptible.