Have done. It started off as a “FCP X needs audio follows video setting for external monitoring” then when it got to trying to check it back and realised I couldn’t monitor separate channels easily without committing them to my final file I had a little ‘moment’. Then sent a nice little feature request.
The fact that external audio doesn’t come out via SDI anyway is a pain, I don’t want to have to send my entire systems audio out via my SDI I/O, I only want my NLE, but I have to or FCPX pictures are out of sync. Annoying little thing. Apart from this it’s been a dream with everything I’ve been throwing at it and been awesome on a big 5K RED job I’m doing. Been working or the R3D files with no issues, loving it.