task main() {
     int color;
     SetSensorColorFull(IN_3);
     OnRevReg(OUT_A, 30, OUT_REGMODE_SPEED);
     while(true) {
         color = Sensor(IN_3);
         if (color == INPUT_WHITECOLOR) {
            StopSound();
         } else if (color == INPUT_BLACKCOLOR) {
            PlayTone(TONE_C5, 1000);
         } else if (color == INPUT_REDCOLOR) {
            PlayTone(TONE_D5, 1000);
         } else if (color == INPUT_YELLOWCOLOR) {
            PlayTone(TONE_E5, 1000);
         } else if (color == INPUT_GREENCOLOR) {
            PlayTone(TONE_F5, 1000);
         } else if (color == INPUT_BLUECOLOR) {
            PlayTone(TONE_G5, 1000);
         }
     }
}