Sadly, there's no Sound Mode in CotM (nor is there a Hugh mode, gyaaaaaah).
Aria of Sorrow, as far as I remember, only has one silent spot- the initial area where Mina and Arikado stand around.
Now, let's see if I have this right: The various classes seem to be based on the following-
Vampire Killer: Leon, Sonia, Trevor, Simon, Juste, Richter, and Julius Belmont, Nathan Graves
Vampire Renegade: Alucard/Genya Arikado/Nathan Farenheit Tepes/Whatever he's calling himself
this sequel
Vanquisher: Sypha and Yoko Belnades
Invoker: Maria Renard
Manbeast: Cornell
Knight: No idea, prolly Victor Belmont from the cancelled Castlevania: Resurrection?
Hehe, there's no chance that Soma's power of Dominance will make an appearance in any future edition, is there? =p
Quoting: Santiago Zapata
considering there are no female protagonists on the GBA games
True, but Yoko Belnades is playable in the DS game (along with Julius and Alucard). Her death scream scares the living shit out of me. =p