Audio AG Support wrote:Please try a different USB cable and/or USB-C port. Directly to the Macbook with no hubs.
Also test USB 2.0 mode. See manual and look for "interface mode".
No hubs, directly connected, everything else disconnected. Tried two of the ports, no difference. I am not using USB 2 as I need the Madi channels, that is why I bought the interface in the first place.
I also won't use class compliant mode, as I need TM, which is the other reason why I bought the interface.
Reading for hours through the various posts on this forum I have collected the following info, although nothing is "official"
- M1 USB audio has a problem, Thunderbolt doesn't
- the v3.3 Kernel driver might help, as one can set a higher buffer value, but Apple is discontinuing direct access to the Kernel, which is why RME has driver v4.7
- USB2 has no problems, because less channels mean less data. That is also why other RME interfaces have no problem, like the BabyFace.
- class compliant mode might solve it (not sure why it should, maybe higher buffer settings?) but then TotalMix is not available anymore except through an iPad - more clutter & devices, not less, I don't like it.
- it seems to be an Apple problem that also other interface providers struggle with, but nobody has heard anything from Apple regarding a fix.
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Meanwhile I did a couple more tests. I tried to open a lot of memory-hungry applications and sometimes, audio will stop for several seconds if I do so. ActivityMoniror did not show any memory swapping.
Also, when I play audio, sometimes it doesn't simply stop but does have some distortion before it stops. Looking at what happens to the sine wave test signal, it is very well possible that I hear some distortion in an audio signal before it is shut off.
Obviously, RME won't be able to help much or else this wouldn't be an issue anymore.
It seems to me that issue is not solvable from our end at this time. I will consider the UFX+ instead, which has Thunderbolt.
