Stefan.
its guesswork without seeing all your settings.
please post pics of the following..its very important.
1. your windows audio record/playback settings including advanced tab.
2. your studiolive ar 12 user control panel settings.
3. your bb was settings in case was works rather than asio.
the above will provide a full and complete snapshot of your settings so the rest of us plus pg support can help further.
off the bat what i see is no input and output ports listed for asio.make sure the correct driver is selected.
you should see ports listed for your asio selection .
the other thing i see is asio 4 all at bottom.
dont you have a proper asio driver for the studiolive from the web site instead of asio4all ?
https://www.presonus.com/products/StudioLive-AR12c/downloadsis the above your mixer ??
note ..on you tube are several you tube vids for studiolive.
ps i suggest if we get it working take pics of your settings in case they are needed in the future.
i assume youve intalled the studiolive control software ??
merry xmas.
om