notes.txt:Update.

doc/notes.txt

@@ -13,6 +13,7 @@ TODO:
 + As threshold increases overall volume decreases - add a compensation algorithm.
 + THere are unintialized variable warnings on the release build.
 + Add preset delete.
++ All uses of va_copy() should have a complimentary va_end() 
 
 // May 22
 + Add invert to scale range to cause output to go in opposite direction.