Definitely recommend DOS2 over DOS1. For me, most all of the tweaky problems have been fixed, all those things that made you live the reset procedure on a regular basis.
I'm one of those people that have had problems with upgrading from DOS1 on DOS2 (Silver Phantom I circa 2015) I did end up with a Bricked out of warranty device. (don't recall exactly how long but it was past but not all that long) This was also shortly after the DOS2 release and Devialet stood behind their product. Perhaps contacting them around the upgrade to get their sage advice and direct support would be a way to hedge your bets if anything should go wrong. In any case I would do it sooner than later the clock is always ticking.
About controlling the volume - this is the only thing i used spark for.
The old v1 remote is junk (perhaps it worked better with DOS1)? but compared to the v2 remote - in practice v1 sits someplace - drains the batteries - gets fresh batteries - repeat.
The android solution in Win11 works well - but it's a small pain when updates are released, updating the android app is a manual process and at least once required a little tweaking either due to WSA (windows subsystem for android ) image changes or APP changes.
it is alive - Devialet on Windows Subsystem for Android (WSA) (2) (devialetchat.com) probably good to reference other articles since there could be some differences in the UX depending on which build/version of Windows and WSA you are using exactly.
this might not be for the faint of tech hacks - there are 3 moving targets, Windows, WSA, and the Devialet app upgrades..
i primarily use slCMDR a CLI app based on the WEB api now part of DOS2.
slaCmdr - pilot your phantoms from the command line (2) (devialetchat.com) https://halrad.com or sometimes use slPhantomTray but found i really use the command line app more than the GUI app. I have shortcuts to set inputs Arch or Dialog to click. and use an elgato streamdeck to run commands from button presses to turn the volume up or down, or to set the inputs. (using slCMDR). Few tweaky things still to work out if you use multiple pairs. still need to use the Android app to pair or unpair devices from "rooms"
But when needed can fire up the android app on one of the desktops and get what i need done without hunting for a phone.
i also have an old android phone i use mostly just as a remote as a back up when you really need it.
but will mention 80-90 % of the time i use the V2 hw remote for my primary listening case.
feedback for devialet: (who has from my experiences the most awesome support team - thank you!)
-> ASK for the Devialet IP control API
- requirement: Devialet Remote control API :
- Enable methods to manage groups. Implement the ability to create | destroy Groups to support multiple systems in a muli-room use case like one can do with the devialet app.
hth