Install audio on HP workstation

Hello everyone,
I have an HP workstation 46. I easily installed Linux on the machine. I have a problem with the audio settings. The speaker works. The microphone does not work. In the settings—> sound menu I do not see an adjustable microphone.
I already bought an external sound card, now I see the microphone (Settings—> Sound), but it does not work.
Any ideas where to start?

HP Z640 Workstation, E5-2630v3 CPU, 32GB DDR4, 256 GB SSD, AMD RX570 4GB

Welcome to Manjaro forumm @jedilovag

Advanced Linux Sound Architecture/Troubleshooting - ArchWiki

No microphone input

In alsamixer make sure that all the volume levels are up under recording, and that CAPTURE is toggled active on the microphone (e.g. Mic, Internal Mic) and/or on Capture (in alsamixer, select these items and press Space). Try making positive Mic Boost and raising Capture levels higher; this may make static or distortion, but then you can adjust them back down once you are hearing something when you record.

As the PulseAudio wrapper is shown as “default” in alsamixer, you may have to press F6 to select your actual sound card first.