Hey @chdloc would it be possible to add a handset only option for sidetone? I like the sidetone but I can't have it when talking on the phone in the car with the audio coming through the speakers as it starts to create a feedback loop and people can hear themselves talk.
Right now I'm busy trying to squeeze every last bit of audio quality out of the Qualcomm audio DACs/amps. I've detailed my first findings here. More to come on tweaking the amp and corresponding measurements.
Anyway, for now you can disable headphone/headset sidetone manually by replacing the entire "voice-headphones" device (from <path name="voice-headphones"> to its corresponding </path>) in mixer_paths.xml with its stock counterpart, i.e.,
<path name="voice-headphones"> <path name="headphones" /> <ctl name="HPHL Volume" value="20" /> <ctl name="HPHR Volume" value="20" /> <ctl name="RX1 Digital Volume" value="84" /> <ctl name="RX2 Digital Volume" value="84" /> </path>