The module works pretty well. Sometimes there is a crackling sound (I don't know how to reproduce it). I have noticed that using a Bluetooth device, disconnect the headphones and connect to the headphone jack on the phone, without turning off the Bluetooth device, then it will also crackle/have a feedback like bug.
That's no big deal. I would however like to ask if it would be possible to implement different sound settings depending on if you play the sound from the device speaker, headphone jack or connected Bluetooth device?
Since the Bluetooth device have it's own volume control, it will usually work together with the audio jack. However if the audio is lowered in the module, then it will often be to low when playing from the internal speakers...
Anyway. Keep up the good work. It have helped a lot since going over to Lineage OS, because the sound is extremely high with it.