The shortcut for adding a clip in Ableton Live is Ctrl + Shift + M (Windows) or Command + Shift + M (Mac). This will create a new empty MIDI clip in the selected track that matches the length of the highlighted region in Arrange View.
Here are some additional points to consider:
- You can also add a clip by right-clicking in Session View and selecting "Insert MIDI Clip."
- The shortcut only works if you have a MIDI track selected.
- Make sure you have a highlighted region in Arrange View before using the shortcut.