python/demos/demo_wav2midi.py: remove unused variables

diff --git a/python/demos/demo_wav2midi.py b/python/demos/demo_wav2midi.py
index f503dc0..48c2d0a 100755 (executable)
--- a/python/demos/demo_wav2midi.py
+++ b/python/demos/demo_wav2midi.py
@@ -48,11 +48,7 @@ track.append(MetaMessage('time_signature', numerator=4, denominator=4))
 
 def frames2tick(frames, samplerate=samplerate):
     sec = frames / float(samplerate)
-    tick = int(second2tick(sec, ticks_per_beat, tempo))
-    return tick
-
-sec = 7
-previous_note = None
+    return int(second2tick(sec, ticks_per_beat, tempo))
 
 last_time = 0