I can't tell, but it sounds like the two things it might do for me are:
1. Allow my software stack to remember and restore levels on a hardware device, so maybe my big on-ear headset is super loud compared to the cheap earbuds I use, lets have the software notice they're different and put the hardware output levels back where they were on each device when it sees them. This avoids the device (which presumably is battery powered) needing to correctly remember how it was set up. I would like this.
2. Try to avoid noise from analogue amplifier stages in the headset by only using as much amplification as is strictly needed for current volume settings, which in turn involves guessing how linear (or not) that amplifier's performance is, or makes my level controls needlessly coarse. I don't want this, I'll put up with it but mostly by finding settings where it's not too annoying and swearing every time it trips up.