Generate both alpha and RGB results from a BFX output node to the timeline. Use the alpha output with Axis or Sparks soft effects for vertical compositing.

Using the dual inputs of the BFX output node, work in parallel with both front and matte clips from any BFX level. You can create an alpha using any Batch node, in any order.

You can output an alpha from a BFX level entered with the Pre or Post option. If you extract a soft effect from an alpha segment, the Batch FX containing the alpha setup is also expanded.

You cannot generate an alpha from clips containing stereo tracks since they do not have a matte output.