Good evening everyone, long time Openelec user here. Just noticed they are no longer developing Openelec so switched over here.
The issue is I have just installed a clean installation of both the current stable release (v7.0.2) & alpha build (v7.90.004 Alpha) on htpc. Noticing no sound, I went straight to system > audio settings and proceeded to change the output device to the HDMI output but to no avail. After switching through all the output devices still no sound. Tried the passthrough option which I always use for my receiver, still no sound. Did some googling and found a thread that the user fixed their issue by changing the sound from optimized to fixed (all sample rates work 24 - 192). Tried this and now I have sound.
The issue is this does not allow for the sound passthrough option as well as I do not want any processing of the audio soundtrack.
Hopefully this is a common issue and there is a quick fix. Thank you in advance for your help.