HELP (stupid and mysterious?) format error - For structure within a MIDI responsive sketch

[Chrisir]

@xiu

  for (this.pitch = 30) {
   fill(255, 0, 0);
   ellipse(this.x, this.y, this.size, this.size); 

this is not needed here.

It is only needed in setup() when the variable names are double (which they aren’t in your code)