void set(uint8_t value, bool on) always sets the first dimmer, not the one it called on.

[FunFrog-BY]

Dimmer dimmers[] = {
  Dimmer(3, DIMMER_RAMP, RAMP_TIME, POWER_HZ),
  Dimmer(4, DIMMER_RAMP, RAMP_TIME, POWER_HZ),
  Dimmer(5, DIMMER_RAMP, RAMP_TIME, POWER_HZ),
  Dimmer(6, DIMMER_RAMP, RAMP_TIME, POWER_HZ),
  Dimmer(7, DIMMER_RAMP, RAMP_TIME, POWER_HZ),
  Dimmer(8, DIMMER_RAMP, RAMP_TIME, POWER_HZ),
  Dimmer(9, DIMMER_RAMP, RAMP_TIME, POWER_HZ),
  Dimmer(10,DIMMER_RAMP, RAMP_TIME, POWER_HZ),
  Dimmer(11,DIMMER_RAMP, RAMP_TIME, POWER_HZ)
};

void handleDimming (byte dimmerNumber, byte value) {
  if (value == 0) dimmers[dimmerNumber].off(); //This works as intended
  else {
    //dimmers[dimmerNumber].set(value, true); <-- This one always applies to dimmers[0] regardless of dimmerNumber
    dimmers[dimmerNumber].on();  //This works as intended
    dimmers[dimmerNumber].set(value);  //This works as intended
  }
}