I have recently been marking locations of all the logs in the game and discovered that it seems a total of 6 Audio Logs will not play there respective audio and will instead immediately end.
I know for a fact that the one in R4E1 with Schaeffer worked when ALT:// R4 initially released. So these could have broke with a recent update.
I don't think it's a problem on my end but I suppose someone could confirm that these logs just don't work.
Here are all the logs that I have seen that will not work. I named based on context of the log, and their zone locations.
R3D1 "Bianhua"
(Broken Audio) Schaeffer | Control (Zone_389)
R4A2 "Foster"
(Broken Audio) Matthew Aarons | Garganta (Zone_45)
R4B1 "Malachite"
(Broken Audio) Schaeffer | Recollection (Zone_52)
R4B3 "Chrysolite"
(Broken Audio) State Of Truth | Castle Truth (Zone_41)
R4C1 "Cognition"
(Broken Audio) Schaeffer | Terminal (Zone_72)
R4E1 "Downwards"
(Broken Audio) Schaeffer | Return to KDS Deep (Zone_459)
I also noticed 2 logs that seem like they should have audio attached but they don't, not sure if they actually just don't have audio or if the devs forgot to add the audio.
R3B2 "Pressure"
(Missing Audio) Daylight Mission Update (Zone_511)
R6C1 "Navigation"
(Missing Audio) D017 (Artus Chaparon) attacked by Shadows (Zone_150)
I know some logs that should have had audio but don't do exist in the game but are intentionally missing audio like some of the Dr. Stokes logs in R7, but the missing audio is clarified in the log itself as-
//audio file not found
R7B3 "Vault"
Dr. Stokes | Quantum Frequency (Zone_108)
No Sound Example