If Audio out went away with Android 3.0, then the Galaxy S3, S4, Note 2 and Note 3 all run a lower version of Android lol
Starting with the Galaxy S5, the version of Android 4.4.2 that Samsung uses removed most of the options in the "Accessory" section in settings. The missing options are what governed sound being heard through a Dock connection (USB). I proved this when i installed a custom ROM on the Note 3 that is a nearly complete direct port of the Stock ROM for the S5. on other ROMs that I have used (that aren't based on Stock S5), the options are intact. If i find a solution, I will post it here. I really like the new ROM, but I cannot use my iBolt dock now because of the missing options.