VPT's mix module composites two sources with a blend mode before the result feeds a layer

The mix module is one of the eight customisable source slots. It takes two source inputs (A and B, chosen from the source menus), combines them with a selectable blend mode (normal alpha-blend, additive, multiply, …) and a mix slider, and exposes the composited result as a named source that any layer can reference. This pre-compositing happens before the layer stage, so you can, for example, multiply a live camera feed with a generative loop and then map the combined image — without an external compositor.

Examples

Set the mix module’s A to 1video (a loop) and B to a live camera, choose multiply, set the mix around 0.7, then assign that mix source to a layer to project a camera-tinted loop.

Assessment

What does VPT’s mix module do, and does it act before or after the layer stage? Contrast the visual result of additive versus multiply blending.