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Sound Mic dont works with DAC Nov 27, 2020

fronex , Nov 27, 2020 :

Hey,

I need your help.
I use the OP 7t, not rooted, Oxygen OS 10.0.14.HD65BA.

Following issue. Cause I use headphones with a 3.5mm jack, I use an USB to jack dongle.
I use the following headphone: beyerdynamic Beat Byrd (https://geizhals.eu/beyerdynamic-beat-byrd-schwarz-orange-733-008-a2019849.html) This headphones dont have a built-in microphone.
and this DAC: Sharkoon Mobile DAC (https://geizhals.eu/sharkoon-mobile-dac-a2191795.html)

Now I recognize, when I put my dongle with the headphones into the phone,
the internal microphone of the mobilephone dont works anymore. But I know, that it already
worked, cause I phoned this way. Maybe that got changed with the last update?
Maybe any advice?

Thanks for your help!