diff --git a/CircuitPython_Essentials/CircuitPython_Audio_Out_Tone.py b/CircuitPython_Essentials/CircuitPython_Audio_Out_Tone.py
index 0316f093..1c619af3 100644
--- a/CircuitPython_Essentials/CircuitPython_Audio_Out_Tone.py
+++ b/CircuitPython_Essentials/CircuitPython_Audio_Out_Tone.py
@@ -13,7 +13,7 @@ frequency = 440  # Set this to the Hz of the tone you want to generate.
 length = 8000 // frequency
 sine_wave = array.array("H", [0] * length)
 for i in range(length):
-    sine_wave[i] = int((1 + math.sin(math.pi * 2 * i / 18)) * tone_volume * (2 ** 15))
+    sine_wave[i] = int((1 + math.sin(math.pi * 2 * i / length)) * tone_volume * (2 ** 15 - 1))
 
 audio = audioio.AudioOut(board.A0)
 sine_wave_sample = audioio.RawSample(sine_wave)