I have not found one either. I have only had mine for a week but I have been slowly reading through the earlier pages of this thread plus I have been keeping up with posts that have been made this week. I remember reading a few earlier ones that indicate that there is currently no line out switch in the options but that one is being worked on. I hope that is true and it will be available in the next firmware update. I would love to be able to run this through my tube amp. I currently use my Opus #1 or my Cayin N3 for that purpose. I think the AP200 is just as worthy of being put to that use.