This isn't really very relevant but I played 2nd Horn in the LSO Mahler 2 video recording with Bernstein and vaguely remember that we did a concert performance and then some video editing where we were required to mime to the already recorded sound track so they could get some close ups of the horns. That section was playing mostly on Conn 8D and Kruspe horns with two Paxmans thrown in so no problems with unplayable notes. This is available on YouTube
https://www.youtube.com/watch?v=Bdc5n562zZg I think all but one of the players in this section are still alive which is good.
1) Jeff Bryant (Kruspe), 2) Tony Chidell (Conn 8D), 3) John Bimson (Conn 8D), 4) Patrick Garvey (Kruspe), 5) John Rooke (Conn 8D), 6) Joe Currie (Paxman) and Bob Noble (Paxman) on bumper horn.