Bluetooth headset microphone not used

General
#1

Dear community,

it seems that on both my devices (Xperia XA2 - main phone, and AquaFish=JollaC) the microphone of bluetooth headsets i have and tried is not used.
At the beginning i thought the mic volume is too low but i realized that only the internal mic is used for recording even if BT headset is connected.
I checked with pactl and the BT source device is there.

The same BT headsets work fine with other android phones.

Does anyone have the same issue? What else could i tinker with so that i solve my issue?

P.S. as i was writing this post i realized that i use regularly the BT connection of my car audio to make phone calls … i believe there it is not the internal phone mic which is used
Is there a way to select the mic for recording?

Regards
binu

#2

Audio Output Chooser from Openrepos is worth a try, although it takes some time to understand all the options.

#3

The source for “recording” is correct. I was able to get normal voice level using “skype test call” ( i love this thing ;-)) by adjusting the volume for source #2, source.droid, to 450%.
Now i need an app to adjust this manually. If possible by dbus, i might do something like btvol from @fridlmue
Or can the volume be adjusted when the pulseaudio card for bluetooth changes to profile headset_head_unit?