When you bring the code in and hover the cursor over that button (labelled +10) it says +10 but there isn't a red dot on the button so I assume there isn't any code associated from the 656 code set. There isn't a red dot on the key to the right of the 0 (Enter), Fast left, fast right, stop, play or pause either.

I was hoping it was a dash until I brought the code in and saw there wasn't a red dot.

There is a - on the original remote to the left of the 0.

Here's a photo of the remote (which I don't have):