Pine Phone Pro audio on phone calls: discussion, support and tips

[Piotr]

1/ My 1st experience was - issue with calls on 4G / Lte . -> I forced phone to 3G only -> this has helped for connection to be established
2/ i noticed voice was low on regular call , but switching to loudspeaker mode and then switching off loudspeaker mode was fixing normal call audio
3/ Then for the quality of the audio (low internal mic sensitivity/gain , low internal speaker, low loudspeaker sound ) you can modify some mic gain , volume parameters in following files (i suggest to make a backup of originals
/usr/share/alsa/ucm2/PinePhonePro/ HiFi.conf [media playback profile settings]
/usr/share/alsa/ucm2/PinePhonePro/VoiceCall.conf [phone call profile setting]
microphone volume setting:
# Set capture volume to 0dB so modem audio doesn't overdrive the ADC
cset "name='ADC Capture Volume' 60"
cset "name='Mono ADC Capture Volume' 99"
speaker volume setting
# Limit amplification factor of earpiece amplifier so sound stays clear
cset "name='Class D SPK Ratio Control' 2.20x"
with above setting Phone call in normal mode works fine for me , but loudspeaker mode is not usable .