message: changing simpleSynth sounds
diff: var synth = new Tone.Synth({
  "oscillator" : {
  - "type" : "square"
  + "type" : "fmtriangle",
  + "modulationIndex" : 1.2,
  + "harmonicity" : 0.25,
  + "modulationType" : "sine"
  },
  "envelope" : {
  - "attack" : 0.01,
  + "attackCurve" : 'exponential',
  + "attack" : 0.05,
  "decay" : 0.2,
  "sustain" : 0.2,
  - "release" : 0.2,
  - }
  + "release" : 1.5,
  + },
  + "portamento" : 0.05
  }).toMaster();
  // GUI //
  