Without a 1070 or 970 in front of me, I'm going just from memory of discussions from when the 1070 was newly released. The bass management switch is there principally for the 7.1 Direct input, but I thought that I'd heard that the HPF/LPF switch would work with the stereo analog bypass mode just as well as it would with the 7.1 Direct input. And since the HPF/LPF switch engages a purely analog bass management circuit, it would not require any A/D/A conversion. The "Digital" position does produce an A/D/A conversion for the 7.1 Direct input, something that otherwise does not take place, but I hadn't ever heard of having it set to "digital" actually influencing the analog stereo bypass mode at all.