Track Mute Keyboard Shortcut

For the life of me, I can't find a way to assign a keyboard shortcut to the act of muting the active (selected) track. Did Cakewalk eliminate the ability to do that? I know in the past, that "Q" was the keyboard shortcut by default, but now, not only is "Q" not the shortcut, but, as far as I can tell, there is no way to assign mute to a key at all. Please tell me I'm just missing it.

Thank you! I searched in the keyboard shortcuts section in the preferences window, couldn't find it. I googled, couldn't find it. I searched here, couldn't find it. I knew there had to be a way. This info will really help me. Thanks again.