Here's a fun experiment that explores the very top of the range of the various instruments. One of the things the Fluxamasynth enables is for you to create Black MIDI-like clusters of sound. Many other MIDI playback chips don't perform well in the highest (120-127) range of notes; this example shows how the Fluxamsynth performs.

//Exploring the upper range of the instrument

#include <Fluxamasynth.h>
#include <PgmChange.h>

Fluxamasynth synth;
int count = 0;
int count2 = 0;
int s = 120;

void setup() {

  synth.midiReset();
  synth.setMasterVolume(50);
  int instrument = 2;
  randomSeed(millis()+analogRead(1));
  for (int i=0; i<4; i++) {
    synth.programChange(0, i, instrument);
    synth.setReverb(i, 1, 127, 25);
    synth.pan(i, 127/(i+1));
  }
}

void loop() {
  int d = random(75)+75;
  for (int i=0; i<5; i++) {
    synth.programChange(0, i, random(127)); 
  }
  for (int i=1; i<4; i++) {
    section(s, 100);
  }
  s = random(10)+117;
  
}

void section(int n, int d1) {
for (int i=n; i < n+8; i++) {
    count++;
    count2+=3;
    synth.noteOn(0, i, 127);
    if ((count2 % 2) ==0) synth.noteOn(1, i-3, 127);
    if ((count % 2) ==0) {
       synth.noteOn(2, i-2, 127);
    }
    if ((count % 3) ==0) {
       synth.noteOn(3, i-5, 127);
    }
   if ((count2 % 6) ==0)synth.noteOn(4, i+2, 127);
    delay(100);
    synth.noteOff(0, i);
    synth.noteOff(1, i-3);
    synth.noteOff(2, i-2);
    synth.noteOff(3, i-5);
    synth.noteOff(4, i+2);
  }
}

 Here's a sample of how it sounds:

Play Sample