replace in opening quotations

node119.html

@@ -106,7 +106,7 @@ achievable delay is one sample.
 Here the objects on the left side, from the top down to the
 <TT>clip&nbsp;-0.2 0.2</TT> object,
 form a waveshaping network; the index is set by the
-``timbre" control, and the waveshaping output varies between a near sinusoid
+"timbre" control, and the waveshaping output varies between a near sinusoid
 and a bright, buzzy sound.  The output is added to the output of the
 <TT>vd~</TT> object.  The sum is then high pass filtered (the <TT>hip~</TT> object
 at lower left), multiplied by a
@@ -121,10 +121,10 @@ that the signal cannot exceed 1 in absolute value.
 The length of the delay is controlled by the signal input to the
 <TT>vd~</TT> object.  An oscillator with variable frequency and gain, in the
 center of the figure, provides the delay time.  The oscillator is added to
-one to make it nonnegative before multiplying it by the ``cycle depth" control,
+one to make it nonnegative before multiplying it by the "cycle depth" control,
 which effectively sets the range of delay times.  The minimum possible
 delay time of 1.46 milliseconds is added so that the true range of delay times
-is between the minimum and the same plus twice the ``depth".  The reason for this
+is between the minimum and the same plus twice the "depth".  The reason for this
 minimum delay time is taken up in the discussion of the next example.
 
 <P>