Bug : Very bad song !!

Hello,



I don't speak english very well, so i will be quick (I'm French).



I recorded some voices on ProTools to an editing session, all were clear but a bug appeared : I have a robot song on all tracks, it's horrible.



I tried to create a new session (without any effect), it's exatly the same problem !



Could you help me please ?

PS : How do you change Audio Output ? I'm working on a Roland Quad Capture and I would test the internal exit.



Thanks !