When I use the Asgard connected directly from my laptop, I can hear a strange tizz that gets louder when I love the mice, scroll, and similar. It goes away If I use the Laptop on battery alone.
I was wondering If I use optical Modi if that would go away .
Yes it would since optical will cut electronic connection between dac and laptop. I have modi that has the same issue. You can fix this easily by using a USB isolator or the non recommended but cheap way is to use a cable or converter plug that doesn't have ground pin for your laptop adaptor. The second one is only save I'd you use a powerboard that has surge and trip protector.
Warning use the second method at your own risk . I never have issue with it but **** happens