I have now tried both CM11 and Slimkat 4.4, both ROMs, after flashing leave the device with no audio output at all. No ringtone, music, headphone output, call audio, nothing. Device is ATT S3 i747. Flashed back to stock JB 4.3 and audio issue is fixed every time. I really would like to run a custom ROM on my phone, but this issue makes it impossible. Does anyone know what could be causing the issue. Does it sound like a kernel or bootloader issue?