--- a/snd.py
+++ b/snd.py
@@ -12,11 +12,15 @@
 import threading
 from pydispatch import dispatcher
 
-CHANNELS = 1
 THRESHOLD = 500
 CHUNK_SIZE = 1024
 FORMAT = pyaudio.paInt16
 RATE = 44100
+if sys.platform.startswith('darwin'):
+	CHANNELS = 2
+elif sys.platform.startswith('win32'):
+	CHANNELS = 1
+
 MAX_SILENT = 30
 
 def is_silent(L):
@@ -77,8 +81,8 @@
     it without getting chopped off.
     """
     p = pyaudio.PyAudio()
-    stream = p.open(format=FORMAT, channels=1, rate=RATE, 
-                    input=True, output=True,
+    stream = p.open(format=FORMAT, channels=CHANNELS, rate=RATE, 
+                    input=True,
                     frames_per_buffer=CHUNK_SIZE)
 
     num_silent = 0