After Effects: Set Alpha/Matte to hdr layer without clamping the values to 0-1 range I have a .hdr sequence as well as a .tga sequence. the .tga sequence contains the alpha channel to be used for the .hdr sequence.

The problem is that if I apply the alpha channel to my hdr sequence using Set Matte or Set Channel, then the color values of my hdr sequence get clamped to 0-1.

How can I mask my hdr sequence without losing the hdr range?

using After Effects CS5
Okay, this tutorial answered my question and provides a workaround.