Its Backspace+Enter on any onyx keypad. That includes the M-Play when its in “Nu” mode (press and hold Select then press “+”. Frustrating that this isnt easily searchable in the help anywhere. The only place i can find it is as a “Tip” if your physically looking at a console. And if anyone has a link to what the “Nu” mode buttons do the only documentstion ive found for that is from screen capping an old David Henry video. It appears that info has been taken down even though the functionality remains?