Change Synth backend

Synth.py

@@ -0,0 +1,42 @@
+import numpy as np
+import sounddevice as sd
+from Note import Note
+import os
+import sys
+import time
+
+FS = 44100 
+
+
+def play(args, env):
+    if len(args) > 0 and isinstance(args[0], list):
+        playList(args[0], env)
+        return    
+    playList(args, env)    
+
+def playList(notes, env):
+    bpm = env.findVariable("bpm", int)
+    if all(isinstance(x, Note) or isinstance(x, int) for x in notes):
+        for x in notes:
+            if isinstance(x, Note):
+                playNote(x, bpm)
+            if isinstance(x, int):
+                doPause(x, bpm)     
+
+def playNote(note, bpm):
+    frequency = note.toFrequency()
+    duration = 60 * 4 / note.duration / bpm
+    sine(frequency, duration)       
+    
+def sine(frequency, duration):
+    samples = (np.sin(2*np.pi*np.arange(FS*duration)*frequency/FS)).astype(np.float32)
+    sd.play(samples, FS)    
+    time.sleep(duration)
+    
+def doPause(value, bpm):
+    time.sleep(60 * 4 / value / bpm)
+    
+def pause(args, env):
+    bpm = findVariable("bpm", env)
+    value = args[0]
+    doPause(value, bpm)