diff --git a/process_bigraph/experiments/signal_modulation.py b/process_bigraph/experiments/signal_modulation.py
index dc927d0..714fb83 100644
--- a/process_bigraph/experiments/signal_modulation.py
+++ b/process_bigraph/experiments/signal_modulation.py
@@ -93,8 +93,57 @@ def update(self, state, interval):
         }
 
 
+class RingModulationProcess(Process):
+    config_schema = {
+        'duration': {
+            '_type': 'int',
+            '_default': 10
+        },
+        #'input_signal': 'list[float]',
+        'mod_freq': 'int',
+        'starting_frequency': 'int'
+    }
+
+    def __init__(self, config=None):
+        super().__init__(config)
+        self.starting_frequency = self.config['starting_frequency']
+
+    def initial_state(self):
+        starting_pitch = start_sine_wave(self.config['duration'], self.starting_frequency)
+        return {'output_signal': starting_pitch}
+
+    def schema(self):
+        return {
+            'output_signal': 'list[float]',
+        }
+
+    def update(self, state, interval):
+        # create new wave
+        new_wave_modulated = apply_modulation(
+            input_wave=np.array(state['output_signal']),
+            modulation_function=tremolo,
+            depth=self.config['depth'],
+            rate=self.config['rate']
+        )
+        print(new_wave_modulated)
+
+        # write out the file
+        array_to_wav(
+            filename=os.path.join(
+                os.getcwd(),
+                'tremolo_' + str(datetime.datetime.utcnow()).replace(':', '').replace(' ', '').replace('.', '') + '.wav'
+            ),
+            input_signal=new_wave_modulated
+        )
+
+        return {
+            'output_signal': new_wave_modulated.tolist()
+        }
+
+
 process_registry.register('medium_distortion', MediumDistortionProcess)
 process_registry.register('tremolo', TremoloProcess)
+process_registry.register('ring_modulation', RingModulationProcess)
 
 
 def apply_modulation(input_wave, modulation_function, **kwargs):
@@ -134,6 +183,34 @@ def tremolo(input_wave, rate=5, depth=0.75):
     return input_wave * modulating_wave
 
 
+def ring_modulation(input_wave, mod_freq=30):
+    """
+    Apply a ring modulation effect to the waveform.
+
+    :param input_wave: NumPy array, the input waveform.
+    :param mod_freq: float, the frequency of the modulating wave.
+    :return: NumPy array, the waveform with ring modulation effect.
+    """
+    t = np.linspace(0, 1, len(input_wave), endpoint=True)
+    modulating_wave = np.sin(2 * np.pi * mod_freq * t)
+    return input_wave * modulating_wave
+
+
+def bit_crusher(input_wave, bit_depth=8):
+    """
+    Apply a bit crusher effect to the waveform.
+
+    :param input_wave: NumPy array, the input waveform.
+    :param bit_depth: int, the target bit depth.
+    :return: NumPy array, the waveform with bit crusher effect.
+    """
+    max_val = np.max(np.abs(input_wave))
+    input_wave_normalized = input_wave / max_val
+    step = 2 ** bit_depth
+    crushed_wave = np.round(input_wave_normalized * step) / step
+    return crushed_wave * max_val
+
+
 def array_to_wav(filename, input_signal, sample_rate=44100):
     """
     Writes a NumPy array to a WAV file.
@@ -162,7 +239,17 @@ def adjust_pitch(starting_frequency, n_semitones):
     return starting_frequency * 2 ** (n_semitones / 12)
 
 
-# array_to_wav(input_signal, sample_rate, 'output.wav')
+def run_instance(instance, num_beats=4):
+    # make the composite
+    workflow = Composite({
+        'state': instance
+    })
+
+    # run
+    workflow.run(num_beats)
+
+    # gather results
+    return workflow.gather_results()
 
 
 '''# Example usage
@@ -345,6 +432,49 @@ def run_instance(instance, num_beats=stop):
     #array_to_wav(os.path.join(os.getcwd(), 'result.wav'))'''
 
 
+def test_ring_mod():
+    stop = 4
+    frequencies = [262, 294, 330, 349]
+
+    def ring_mod_create_instance():
+        return {
+            'ring_modulation': {
+                '_type': 'process',
+                'address': 'local:ring_modulation',
+                'config': {
+                    'mod_freq': 30,
+                    'starting_frequency': frequencies[0]
+                },
+                'wires': {  # this should return that which is in the schema
+                    'output_signal': ['output_signal_store'],
+                }
+            },
+            'emitter': {
+                '_type': 'step',
+                'address': 'local:ram-emitter',
+                'config': {
+                    'ports': {
+                        'inputs': {
+                            'output_signal': 'list[float]'
+                        },
+                    }
+                },
+                'wires': {
+                    'inputs': {
+                        'output_signal': ['output_signal_store'],
+                    }
+                }
+            }
+        }
+
+    measure = []
+    starting_signal = start_sine_wave(stop, frequencies[0])
+    instance = ring_mod_create_instance()
+    result = run_instance(instance)
+    measure.append(result)
+
+
 if __name__ == '__main__':
-    test_tremolo()
+    test_ring_mod()
+    # test_tremolo()
     # test_medium_distortion()