Yosuke Otoha (bakegarasu): Yes, and the negative sounds will probably be something like indistinct yelling (older man), punches, swords clashing... general fighting sounds. Music.

Ken Amada (AU) (miseris_socios): Yep. Sounds include the roar of some indistinct creature and the faint beep of hospital machines. Occasionally it'll also include the sound of a buzzsaw, depending how active Nemesis is. Music. More music.

Edit: No buzzsaw now, but armor clanking.

Caleb Widogast (katzenpfote): Yeah. A roaring fire (like a huge blaze, not a campfire), the screams of people, the faint mutterings of a madman. Music.

Naoya (crouching_sin): Yep. His darkness is more like cold laughter with a great deal of pain in it, plus faint whispering like someone just out of hearing range. Music.