this takes care of it :+1: 
https://github.com/xbmc/xbmc/pull/4336/files#diff-1fcb014e3b7898630c0bad96080d4d49R157

hasPassthroughFormats is set to true whenever we add AE_FMT_DTS or AE_FMT_AC3 to our supported format list (which is true in the fake passthrough stuff too...)