changing var to match the expected argument to gainRamp

src/epics/util/lib/Product.pm

@@ -35,7 +35,7 @@ sub printEpics {
 sub printFrontEndVars  {
         my ($i) = @_;
         print ::OUT "double \L$::xpartName[$i]\[8\];\n";
-        print ::OUT "double $::xpartName[$i]\_CALC;\n";
+        print ::OUT "float $::xpartName[$i]\_CALC;\n";
 }
 
 # Check inputs are connected