For now, just experiment with the various level controls to find settings that work reasonably well.
The answer to this question is a bit complex because there are so many different sound cards and they don’t all behave in the same way, so if you want to get to the bottom of this, please start a new topic.
I’ll not be on the forum so much over the next couple of days because I’ve got a lot of other work on, but I’ll keep an eye out for your post and get back to you as soon as I can 