Procedural Compositing with Batch > Batch: Node Reference >
Matte Curves Node

Use the Matte Curves node to access the Matte Curves menu, where you can adjust the luminance of input mattes. The Matte Curves node is the same as the Modular Keyer Matte Curves node. See Result Node.

The Matte Curves node processes gaps in clips set to No Media based on the input tab receiving the information.

Input | Result
--- | ---
Front | Black frames
Back | Black frames
Matte | No media