Hey Jammusique,
Thanks for the reply. I look forward to hearing your experiments with your PCM91. However, Mr. Verta does not use his Lexison 300 plug-in (outbound reverb) to replace the Altiverb tail, but uses the oubound reverb in addition to it. If you look at the page 2 (see here: http://community.vsl.co.at/forums/t/19166.aspx?PageIndex=2) on the post you'll see in the Altiverb image that the tail is still engaged in Altiverb. He's treating Altiverb as the room it was recorded in, and that room would have it's own tail in addition to the outbound reverb.
Thanks again, Brian