this has ben an issue in this hobby since day one, and still is.
All components output at their own levels. That's something we can do nothing about.
In the past, I recall some tuners and tape decks would have output level controls on them but those days are long gone. your computer should allow this, and maybe external DACs but, on the whole, I can't think of any others
So, unless you can find individual components that allow you to set their output levels (I can't think of any) you're going to have to find a receiver/amp that allows you to set each input level individually.
I can't think of any that do, but there's a lot of stuff out there today with which I'm not familiar. What retail box stores said modern units will do this, and units did they recommend?
good luck in your quest.