How do FTB, Cut, and Mix work? Where is the Mix parameter?

CUT: Hard cut, no transition. Shortcuts Enter or C.

MIX (AUTO): Auto transition (cross‑dissolve). Click MIX or press A/M to select the mode, then Enter to execute (default ~1 s). If the Transition panel is visible, set type to FADE and adjust Duration (ms) (about 100–5000 ms) for the mix length.

FTB (Fade to Black): Fade to black. B or F toggles FTB on/off.