> I wish that the ADI-2 Pro could be capable of a preset store/load function.

You can store and load up to 9 presets with all ADI-2 * since the beginning when the devices had been released.
See also handbook chapter
- 5.2 overview menue structure
- 14.2 Load/Store all settings

> It bothers me a bit whenever I change my setup to invest quite some time, changing each channel settings,
> EQ settings, samplerate settings and so on and so on… It's rather boring and time consuming to scroll through
> the entire setup and change things according to the situational needs

I propose this workflow:
1. Save the current setting to preset 1 first, not too loose it.
2. Then save it to another preset of your choice and adjust there only the little changes for new situational needs.

> An example: When I would like to connect a balanced headphone I have to change several things in the menu,
>  EQ settings, samplerates etc.  But in case of a recording session, the situation changes as well, and as you can
> imagine, the setup is completely different again. It would be more productive to store and load these situations
> in an instant.

For this the ADI-2 * family provides you with 9 preset slots.

A) I would start with a preset which contains the basic settings that are valid for most or all of your other setups.
To put only a few examples:
- Bass/Treble on or off
- Dynamic Loudness on or off
- Customized Dynamice Loudness settings
- EDIT1: The very useful remap key function
- etc etc
Save this to i.e. preset 9 as a kind of template for all other presets.

B) Save this template now to preset 1, 2, 3 ...
Then recall/edit/save preset 1, 2, 3 and customize it to your situational demands.

By this you only have to work on the much smaller "deltas" of settings, as your base settings are already configured.
Choose a significant name for each setup when storing a preset, so that you can identify/find them easier.

One additional note in regards to EQ settings: You do not have to change them in each of your setups!
The up to 22 EQ settings are stored in a separate area (see also handbook chapter 13).
This work needs to be done only one time !
Its then simply a library of up to 22 EQ settings which you can access and sweep through from all of your up to 9 customizeable device settings of the ADI-2 *.

This workflow should be exactly that, what you are looking for and saves you a lot of time.

Many thanks, very kind from you Bernhard.

The sound of movies (including such a volume control) is processed in the apps that play those movies, they usually have a midnight mode etc.

The ADI-2s don't have resources left to perform compressor style functions.

I'd like to see option of upconvert all PCM streams to DSD before DAC section on any digital inputs.
as TEAC UD-505 or PS Audio DirectStream was made

I miss the freedom to select a desired output in my DAW. Something like a multichannel mode for ASIO.

A 1/2
A 3/4
AES Out
SPDIF Out
and so on.

With my proposal, problems from previous posts, e.g. compression and EQing, could be resolved by implementing them directly into the DAW.

In regards to the last sentence, sorry but I do not understand the rationale behind it.

Many people use the ADI-2 Pro/DAC simlpy as DAC / phone preamp, which is kind of "stand-alone mode" without PC / DAW.
I think the main purpose of the PEQ is simply to have it built-in into the device itself to fine tune the sound of your phones to your actual demands or to compensate certain hearing issues etc (see also handbook in regards to different use cases).

If you have the ADI-2 Pro / DAC directly connected to a PC and work with a DAW, then I would assume that you work with the different VSTs (EQ, compressors) that the DAW or 3rd party VSTs offer. There you also have more Bands, higher Q-Factors, etc. On the PC side it is possible without any issues because you have much more scalable CPU resources. Some high-end CPUs (or dual CPU setups) are alone even more expensive than ADI-2 Pro/DAC.

As there are so many EQs available for DAWs, I wonder why you see a demand to implement the PEQ into the DAW. Its optimized for being used inside of the DAC.

Or could you kindly explain what you mean exactly ? Thanks.

You overlooked MC's post #13.
Its possible just right now.
All that you need to do is to unplug the device from USB and switch to multi-channel mode.
See also Handbook chapter 17.4.