Is this normal behaviour?
https://photos.app.goo.gl/J6CYcZ5Y28zz2Mzr5 (short video recording)
The BPM is all over the place. All I did was connect my Digitone 2 to Ableton on Windows 11. Everything is updated, including drivers for my audio interface (Presonus Studio 26c).
That’s really not too much jitter on the slaved device, in my experience at least. Looks like you’re reading between 111.4 and 112.1 which is a little more than I like to see, but it’s actually less than 1 bpm.
Can you hear it (i.e. is the problem audible) or is it mostly what you’re seeing that you’re concerned about? Is everything else working correctly?
Is it “synced” meaning digitone 2 is using it’s own sequencer and only the transport is being controlled? I assume you have it set to receive clock and not just transport?
I understand why you would have concerns, but I think this is probably going to be more common than you might imagine.
Assuming you’re connected via USB, make sure you’re testing this connected directly to a primary USB port on your PC and not through a hub to rule that out as a potential cause.
If you’re connected via DIN through your audio interface, unplug it and at least temporarily try connecting directly to your PC via USB for audio and midi, assign it to an ableton track as the audio interface, and then test again just to rule out anything in between the device and the DAW. See where that gets you.
Oh, ok! I assumed that “modern technology ™” wouldn’t have MIDI jitter sync issues 
(wrongly). It’s definitely noticable when trying to sync a recording. It’s like the BPM never rests at one place, so everything is super fluid (all over the place). I tried syncing Digitone (master) to Ableton (slave) as well but that went even worse! No USB hub used either, just directly into the PC. The Digitone was set to receive clock signals too. How the heck did they do this stuff in the 90s 
If you’re getting audible jitter, I’d suggest that you (at a minimum) try a different USB cable before you give up on it.
Are you using overbridge or just the regular USB audio / midi mode?
There’s an option under the port settings for USB and midi, or USB only, and in the manual it says that the combined USB/midi can lower the USB midi bandwidth (it limits the amount of data which can be transferred). So, while sync should not be a very high amount of data, I’d probably also go in there and select USB only as the midi type, just to rule that out as well.
Like I said, a little jitter is normal (visible jitter) so seeing it fluctuate a few points but still under a BPM doesn’t seem crazy to me, but when you can hear the audio suffering because of it then I do think something else might be at play, so at least try these things and if necessary send elektron a message on their website with your video attached to see if they have any input.
The USB is brand new from Elektron (just got the unit a couple days ago). BUT - something you said made me want to try a new thing, and now I got a pretty stable sync.
I disabled receiving clock signal on the Digitone, so when I press play/record on Ableton - all it does is fire the transport message. Works much better than Ableton constantly sending sync/clock updates which obviously didn’t work very well 
EDIT:
Be aware though, the two clocks will not run at the same tempo so this introduces a new issue… Over time, the tempo will be out of sync. It will not line up with the ableton grid. This might be preferable to then edit the ableton project tempo to a decimal point value which matches the digitone bpm in a worst case scenario, however it will be easiest if you can get them to sync properly before you introduce the other headache of trying to align all the tracks later.
I don’t know, I think I’d still mess with it a bit more before you give up. At least try the port thing I mentioned above.
If you aren’t using any DIN connections then try setting the “input from” and “output to” settings under the midi > port settings to “USB” as opposed to USB+MIDI and see if there’s any improvement. May do nothing though.
Usb sync works really bad natively. Overbridge is solid.
I have no trouble syncing my Roland TR-8S with the Digitone II though, but with regular old MIDI…