I found the quaking rather comedic, like a character will just be going on about something when suddenly -quack- It's like it's (wait for it) ..out of their control? xD Anyways, I liked the quacking. I'd recommend making it stand out within the dialog quackrather than removing it.
im so late to this i was lookin back at my account and realized i never replied to this comment but LOL yeah i guess the quacking is outta their control xP