TOTAL_DURATION(5000)  // Total duration in milliseconds
SINE 0 1000 440 1.0      // Sine wave starts at 0 ms, lasts for 1000 ms, frequency 440 Hz, full volume
SQUARE 0 1000 440 0.5    // Square wave starts at 0 ms, lasts for 1000 ms, frequency 440 Hz, 50% volume