How did you get the error code from the throw? Im trying to do voice processing and track down an error so I know whats going wrong. I just get the following AU (0x10811fb40): auou/vpio/appl, render err: 18,446,744,073,709,551,615 18446744073709551615 seems to be the max value for 64 bits... What are you attaching the sink for?