Because I'm using WindowsXP 32 bit with a Creative Labs X-Fi Xtreme Gamer Fatal1ty Pro card, I had the "sponge your speaker cones off of the back wall" pink noise feature which RSC solved for me by cranking back the H/W acceleration to Basic.
Having read this thread, I renamed 'OpenAL32.dll' to 'OpenAL32.dll.original' and switched on the EAX effects in the Game mode of the Creative Console. Now I get full 5.1 3D sound stage with minimal (that is barely audible) phasing. Back to the 'almost'...
Using the Class 158 with AP Sound Pack on the Bristol to Exeter route, I can't hear either horn from inside the cab. I can live with that
Edit: I've turned the H/W acceleration back up to full and I now get AP's sound pack in all its glory complete with jointed rail effects and horns available anywhere.
Therefore the original solution to my sound issues should have been: Back up and delete or rename the OpenAL32.dll file in the root directory of TS 2013.
