Have you checked your AW8 monitoring settings? I would in any case switch monitoring off, both in the MME driver setup and in Logics audio driver menu (To monitor yourself, use an external mixer, I guess you got one, otherwise an AW8 would not make much sense). Monitoring the input via the same output as your allready recorded material could of course cause some digital overload of the output. Also, as Christian Hofman allready stated, check for feedback loops. Good luck, Sascha