We can probably thank Manannan for that. Softspoken is how a slave should speak after all. When I was talking about Graham being softspoken I was mainly referencing this from the KQ Omnipedia:
"His voice quiet and measured when he spoke, such was the aura of vitality and inner strength he projected, however he overshadows all others in his company. The authority he commands over his knights is absolute, but is not the authority of force and coercion. Rather, it is an authority derived from the absolute belief and trust he inspires in his people.[53] Graham accorded all who spoke before him the same weighty respect, knights and common folk alike. His face was thoughtful and he considered what they had to say.[54]"
Although, according to my crazy brain, I can't decide what Graham sounds like when I write my KQ5 fanfiction as it's switching between Josh Mandel's and Jason Michael Victor's voice for our favorite king, depending on the scene. Which as you can imagine, is annoying.