Having listened to the extract, my contribution seems to consist of possibly yelling a bit at the beginning (?), with the majority of the clip featuring Ramon (basso) and Toby (basso profundo). The artwork also seems to be the same as the image used for Grey Angel, although it's possible that neither will be used as the actual CD cover.
Anyway, here's a synopsis, a link to the clip and some artwork to look at:
As the renegade forces of the Warmaster storm across the galaxy, a very different kind of war rages in the shadows of the Imperium – the Knights Errant, chosen of Malcador himself, move quietly in the dark places where others cannot. Battle-captain Nathaniel Garro makes his way to the Imperial Fists’ mighty starfort Phalanx, seeking out another kindred soul for his elite band of warriors.
Performed by John Banks, Toby Longworth and Ramon Tikaram.