If you're using feedback, you can put an event on the note you want to force on or off (depending on what it is to begin with). I use a "*" but you can use anything really.
Once you've finished your chart, simply open it up in notepad (or similar) and do a replace all on the event you placed.
So if you used a "*" like I do, simply do the following
Find: E *
Replace: N 5 0
This only works GH3 onwards.
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Please, call me Ginger :D