Hi ! Did you manage to solve the problem ? I had the same result. I tested another ROM with same result
for me it was because I had the app AudioFX twice.
Once in the directory priv-apps and once in the directory system.
Don't know what is going on there but to make sure it works I've made over a dozen calls with the Bluetooth headset and still working the same as the first one
If you have updated to the latest Nightly you will need to delete the app again
With me also, lockscreen has no effect at all.:cyclops:
Here you go