Thanks for your quick answer.
In armbian-config -> system i can´t see a submenue "hardware". I checked all available menues and could not find anything related to the analog audio.
No, aplay does not show the analog soundcard.
firefly@renegade:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: rockchiphdmi [rockchip,hdmi], device 0: ff000000.i2s-i2s-hifi i2s-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
> Did you configure /etc/asound.conf for the analog soundcard?
This file is not available on my system, at least not in this folder.
>Did you raise the volume in alsamixer?
The output is nowhere to be seen, as such also no volume for it. The general volume is fine, but using HDMI output instead.