replace in opening quotations

node120.html

@@ -86,8 +86,8 @@ tilde objects, and because of the connections, the object <TT>a~</TT> must
 produce its output before either of <TT>b~</TT> or <TT>c~</TT> can run;
 and
 both of those in turn are used in the computation of <TT>d~</TT>.  So the
-possible orderings of these four objects are ``a-b-c-d" and
-``a-c-b-d".  These
+possible orderings of these four objects are "a-b-c-d" and
+"a-c-b-d".  These
 two orderings will have exactly the same result unless the computation of
 <TT>b~</TT> and <TT>c~</TT> somehow affect each other's output (as
 delay operations might, for example).
@@ -98,7 +98,7 @@ delay operations might, for example).
 <TABLE>
 <CAPTION ALIGN="BOTTOM"><STRONG>Figure 7.26:</STRONG>
 Order of execution of tilde objects in Pd: (a), an acyclic network.
-The objects may be executed in either the order ``a-b-c-d" or ``a-c-b-d".  In
+The objects may be executed in either the order "a-b-c-d" or "a-c-b-d".  In
 part (b), there is a cycle, and there is thus no compatible linear ordering of
 the objects because each one would need to be run before the other.</CAPTION>
 <TR><TD><IMG
@@ -253,7 +253,7 @@ a new object:
 <TABLE>
 <CAPTION ALIGN="BOTTOM"><STRONG>Figure 7.27:</STRONG>
 A patch using block size control to lower the loop delay below
-the normal 64 samples: (a) the main patch; (b) the ``delay-writer" subpatch
+the normal 64 samples: (a) the main patch; (b) the "delay-writer" subpatch
 with a <TT>block~</TT> object and a recirculating delay network.</CAPTION>
 <TR><TD><IMG
  WIDTH="558" HEIGHT="252" BORDER="0"