mobile

I used to have USB audio out when on Android 4.4 but now all the Lollipop roms that I've tried don't seem to let me use it. I've tried CM, the standard GPE and some others but still the same.
Googling isn't helping so is it a limitation of Android 5 or have some ROMS removed it? If someone has it on a Lollipop ROM please let me know and I'll install it!