1. The Basics: Loading Your Media

Load content into the Source A and Source B panels.

• Load a File: Click the File button to select a video from your computer.
• Use a Device or Share Screen: Click the Device button.
  • To use a camera/microphone, select them from the dropdowns and click "Confirm".
  • To share your screen, click the "Share Screen" button. A new dialog will appear where you can select which screen, window, or browser tab to share.

2. Core Mixing Controls

• Crossfader: The main horizontal slider. Slide left for Source A, right for Source B.
• CUT Buttons: Instantly cut between sources.
• AUTO Transition: Perform a smooth, timed transition using the selected effect. Adjust the duration in the box next to it.
• Transition Types: Select visual transitions like Fade, Wipe, or Fade to Black from the dropdown.

3. Source Deck Controls (Playback & Looping)

These appear once a video file is loaded.

• Play/Pause & Stop: Standard playback controls.
• Waveform Scrubbing: Click and drag on the audio waveform to scrub through the video.
• Looping:
  • Click Loop to toggle looping.
  • Double-click Loop to reset loop points to the full video duration.
  • Use [ (In) and ] (Out) to set a specific loop segment.

4. Pan & Zoom

Directly reframe your video sources in the A and B panels.

• Pan (Move): Click and drag the video.
• Zoom: Hover over the video and use your mouse wheel.

5. Audio Controls

• Volume Faders: Adjust volume for each source on the far left and right.
• VU Meters: Monitor audio levels to prevent clipping.
• Master Volume: Control the final output volume.
• Audio Output: Select a different speaker or headphone output.

6. Visual Effects (VFX)

Apply effects from the "Effect" dropdown. An effect's parameters will appear in the panel below the main controls.

• Chroma Key (Green Screen): After selecting the effect, click the eyedropper icon, then click on the Output video to sample a color to make transparent. Adjust "Sensitivity" to refine the key.

7. Output & Recording

• Resolution: Set a fixed output resolution (e.g., 1080p, 720p) or leave it on "Auto".
• Pop-out Window: Moves the output to a separate window, ideal for a second monitor.
• Recording: Select a format (.webm or .mp4) and click Record to start.
• Virtual Camera: Click the button for a detailed guide on using the output in other apps like OBS or Zoom.

8. Advanced Features

• MIDI Control Mapping: Automate your workflow by mapping physical controls.
  1. Connect your MIDI controller and select it from the "MIDI Input" dropdown.
  2. Click the flashing Learn button. It will turn solid blue.
  3. Click any mappable control in the interface (e.g., the crossfader, a volume fader, a CUT button). It will be highlighted.
  4. Move a knob/fader or press a button on your MIDI device. The mapping is now complete.
  5. The Learn button will start flashing again, ready for the next mapping. Click it again to exit Learn Mode.
• Save/Load State: Save your entire session (fader positions, loaded files, VFX settings, and MIDI maps) to a file, and load it back later.

To use this application's output as a video source in other programs (like OBS, Zoom, or Discord), you need to use the Pop-out Window feature combined with screen capture.

Step 1: Pop-out the Output

Click the Pop-out Window button. This opens a clean, borderless window containing only the video output. We recommend moving this window to a secondary monitor if you have one.

Step 2: Capture the Window

In your streaming or video conferencing software, add a new "Window Capture" source (the name may vary slightly).

From the list of available windows, select the one titled "Video Mixer Output".

Recommended Setup (OBS Studio)

1. Click the Pop-out Window button.
2. In OBS, under "Sources", click the '+' icon and select "Window Capture".
3. Give it a name (e.g., "Video Mixer").
4. In the Properties dialog, choose "[chrome.exe]: Video Mixer Output" from the "Window" dropdown.
5. Click OK. You should now see the mixer's output in your OBS scene.
6. Optional: If you plan to stream, you can start the "Virtual Camera" in OBS to make this source available to other apps like Zoom or Discord.