• Click the Media panel in the top-center section of the window, right-click to load the raw videos into the panel.
• Double click the original video: it will be loaded into the Monitor (top-right section of the window).
• Play the video in the monitor and select the IN and OUT cut points using key I and O.
• Click the Append Clip button (or press the U key) to insert the selected clip into the timeline (the bottom-center part of the window).
• Repeat the above two steps to add all the required clips into the timeline.
• Add the fade-in/fade-out effect for both video and audio on each clip:
  • Double-click the clip into the timeline: the Edit panel will be displayed in the top-center section.
  • Using the + button at the bottom of the Edit panel add two effects:
    • Fade ⇒ Fade to Black In/Out
    • Audio ⇒ Volume
  • The two effects will be listed into the Edit panel.
  • Click the Hamburger menu button next to the Fade to Black In/Out filter and choose Open in Keyframe Tool.
    • A graph of the filter will be displayed over the clip into the timeline. Here you can add handle points (Flowblade calls them keyframes) and move them to change the shape of the line. The fade-in effect is obtained with a line starting from zero and rising to 100 e.g. in 2 seconds. A fade-out is obtained with the line starting from 100 and going down to zero.
    • Click anywhere on the timeline to close the Keyframe Tool.
  • Similarly click the Hamburger button next the Volume and Open in Keyframe Tool to set the fade-in fade-out for the audio. Notice that normal volume is 0 dB and silence is -70 dB on the scale.

In the Keyframe Tool you may accidentally add a keyframe (handle point) that you want to remove. Close the Keyframe Tool clicking anywhere on the timeline and double click the clip so the Edit pane is shown. Here you can jump over each keyframe added to the filter using the buttons Previous keyframe and Next Keyframe. When you are over the unwanted one, click Delete Keyframe button (the minus).

The Edit panel with two filters added: the video Fade to Black In/Out and the audio Volume:

The Keyframe Tool used on the Fade to Black In/Out filter and the audio Volume filter respectively: