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python/demos/demo_sink_create_woodblock.py: fix wavetable

--- a/python/demos/demo_sink_create_woodblock.py

+++ b/python/demos/demo_sink_create_woodblock.py

@@ -32,7 +32,11 @@

 # compute sinetone at floating point period

 for i in range(duration):

     x = int((i % period) / float(period) * tablelen)

-    sinetone[i] = (sinetable[x] + sinetable[x+1]) / 2

+    idx = int(x)

+    frac = x - idx

+    a = sinetable[idx]

+    b = sinetable[idx + 1]

+    sinetone[i] = a + frac * (b -a)

 # apply some envelope

 float_ramp = arange(duration, dtype = 'float32')

@@ -39,7 +43,7 @@

 sinetone *= exp( - e * float_ramp / duration / decay)

 sinetone[:attack] *= exp( e * ( float_ramp[:attack] / attack - 1 ) )

-if 0:

+if 1:

     import matplotlib.pyplot as plt

     plt.plot(sinetone)

     plt.show()