diff --git a/adafruit_circuitplayground/express.py b/adafruit_circuitplayground/express.py
index f9eeaaf..ccd8e2c 100755
--- a/adafruit_circuitplayground/express.py
+++ b/adafruit_circuitplayground/express.py
@@ -563,24 +563,25 @@ def red_led(self, value):
         self._led.value = value
 
     @staticmethod
-    def _sine_sample(length):
-        tone_volume = (2 ** 15) - 1
+    def _sine_sample(length, volume=None):
+        if volume is None:
+            volume = 0
+        tone_volume = (2 ** 15) + volume
         shift = 2 ** 15
         for i in range(length):
             yield int(tone_volume * math.sin(2*math.pi*(i / length)) + shift)
 
-    def _generate_sample(self, length=100):
+    def _generate_sample(self, length=100, volume=None):
         if self._sample is not None:
             return
-        self._sine_wave = array.array("H", Express._sine_sample(length))
+        self._sine_wave = array.array("H", Express._sine_sample(length, volume))
         if sys.implementation.version[0] >= 3:
             self._sample = audioio.AudioOut(board.SPEAKER)
             self._sine_wave_sample = audioio.RawSample(self._sine_wave)
         else:
-            self._sample = audioio.AudioOut(board.SPEAKER, self._sine_wave)
+            raise NotImplementedError("Please use CircuitPython 3.0 or higher.")
 
-
-    def play_tone(self, frequency, duration):
+    def play_tone(self, frequency, duration, volume=None):
         """ Produce a tone using the speaker. Try changing frequency to change
         the pitch of the tone.
 
@@ -597,11 +598,11 @@ def play_tone(self, frequency, duration):
             cpx.play_tone(440, 1)
         """
         # Play a tone of the specified frequency (hz).
-        self.start_tone(frequency)
+        self.start_tone(frequency, volume)
         time.sleep(duration)
         self.stop_tone()
 
-    def start_tone(self, frequency):
+    def start_tone(self, frequency, volume=None):
         """ Produce a tone using the speaker. Try changing frequency to change
         the pitch of the tone.
 
@@ -626,16 +627,14 @@ def start_tone(self, frequency):
         length = 100
         if length * frequency > 350000:
             length = 350000 // frequency
-        self._generate_sample(length)
+        self._generate_sample(length, volume)
         # Start playing a tone of the specified frequency (hz).
         if sys.implementation.version[0] >= 3:
             self._sine_wave_sample.sample_rate = int(len(self._sine_wave) * frequency)
             if not self._sample.playing:
                 self._sample.play(self._sine_wave_sample, loop=True)
         else:
-            self._sample.frequency = int(len(self._sine_wave) * frequency)
-            if not self._sample.playing:
-                self._sample.play(loop=True)
+            raise NotImplementedError("Please use CircuitPython 3.0 or higher.")
 
     def stop_tone(self):
         """ Use with start_tone to stop the tone produced.
@@ -690,13 +689,9 @@ def play_file(self, file_name):
                 while audio.playing:
                     pass
         else:
-            with audioio.AudioOut(board.SPEAKER, open(file_name, "rb")) as audio:
-                audio.play()
-                while audio.playing:
-                    pass
+            raise NotImplementedError("Please use CircuitPython 3.0 or higher.")
         self._speaker_enable.value = False
 
-
 cpx = Express() # pylint: disable=invalid-name
 """Object that is automatically created on import.