More examples and some minor fixes

examples/sonicsynth/play_with_sonicsynth.py

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+'''Simple example of using SonicSynth to play Ziffers melody.'''
+from sonicsynth import *
+from ziffers import *
+import numpy as np
+
+melody = zparse("(q 0 4 2 5 e 3 9 4 2 s 5 3 1 6 8 3 4 5 2 1 q 0)+(0 3 -2 4 2)", key="E3", scale="Aerathitonic")
+
+def build_waveform(melody, bpm):
+    for item in melody.evaluated_values:
+        if isinstance(item, Pitch):
+            time_in_seconds = item.duration * 4 * 60 / bpm
+            yield generate_square_wave(frequency=item.freq, amplitude=0.25, duration=time_in_seconds)
+
+waveform = np.concatenate(list(build_waveform(melody,130)))
+
+player = Playback(44100)
+player.play(waveform)

examples/sonicsynth/test_arpeggio_effect.py

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+'''Testing arpeggio effect with sonicsynth and ziffers'''
+from sonicsynth import *
+from ziffers import *
+import numpy as np
+
+melody = zparse("(q 0 024 2 246 e 4 2 6 2 q 5 0)+(0 3 1 2)", key="D4", scale="Minor")
+
+def build_waveform(melody, bpm):
+    for item in melody.evaluated_values:
+        if isinstance(item, Pitch):
+            time_in_seconds = item.duration * 4 * 60 / bpm
+            yield generate_sine_wave(frequency=item.freq, amplitude=0.5, duration=time_in_seconds)
+        elif isinstance(item, Chord):
+            time_in_seconds = item.durations[0] * 4 * 60 / bpm
+            for pitch in item.pitch_classes:
+                # Create "NES arpeggio effect"
+                for i in range(1,len(item.durations)):
+                    yield generate_sine_wave(frequency=pitch.freq, amplitude=0.5, duration=time_in_seconds/(len(item.durations)*3))
+
+waveform = np.concatenate(list(build_waveform(melody,180)))
+
+player = Playback(44100)
+player.play(waveform)