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python/demos/demo_wav2midi.py: remove unused variables

--- a/python/demos/demo_wav2midi.py

+++ b/python/demos/demo_wav2midi.py

@@ -48,11 +48,7 @@

 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