I've tested a little more on my issue with small - not so often, clicks in the audio path. It almost sounds like a very good new vinyl record, where you sometimes hear a little click.

I've tested in Cubase pro 9.5.1, at different RME driver sample buffer settings. And it's like it happens on all buffer settings. I thought there would be a difference between say 512/256, and the lowest 32 sample buffer, but there isn't. I hear the same few clicks on the audio path, that as said sounds like a few clicks on a vinyl record.

I've made a little screen-capture of the RME driver settings panel:

https://www.dropbox.com/s/pn50zwbu4hp4q … r.JPG?dl=0

I've also checked the Raydat's IRQ sharing, and it's seems like to have it's own IRQ 10 (-13), where no other devices is present.

Hmm... the DPC latency is pretty low. I'm getting a few peaks up to about 150 microseconds, and in generel DPC stays in the 0-50 microseconds area.

The next thing I wanna try is, to disable C-states cpu power saving in BIOS, cause the latency is lower to half of what is is now. Just to be sure, that the DPC latency doesn't play tricks on me :-)

Another thing I stumbled across is, that right after I've loaded Cubase, and turns up the volume a lot. I can hear some strange noise out of the speakers.  But the minute I start playback, all noise is gone. Also when I stop playback again. It's like there is something, that is getting initialized when you press play in Cubase for the first time after boot, and then it eliminates the noise, high pitched tones completely. Has any of you heard this?

Hmm.. I'm not sure if this is coming from the Raydat, or it is Cubase. But I didn't hear it with my older HDSP 9652, on my old Q6600 computer. So it's a new thing with the Raydat, and mu new i7 8700 computer.

EDITED:
Updated link for RME driver setup image.

Thanks a lot MC for helping out.

(I've updated  the image link above, of my drivers settings!) I only have the Raydat, and the Nuendo 8 I/O in the other end. So only one external digital AD/DA device.

As said, it's not like the clicks are very dominant. But there is a few clicks in the audio path continuously, when I playback audio. In stop mode, when nothing is playing, there is no clicks.

Yesterday I saw the "digital input, ADAT led" on my Nuendo 8 I/O", blink once. I guess this is clock stability, when this led blinks. So maybe it is a broken ADAT cable. I'll try out your suggestions a little later today.

1. Switch the current ADAT cables out. They are pretty old, so I switch them out with the  once in the Raydat box.
2. My BIOS, disable C-states, just to lower the DPC latency to an absolute minimum, nearly nothing. To be sure, that DPC isn't making problems.
3. I  would try the other Raydat firmware. I've tried to download it, but the link doesn't work?

All the best,

Thanks MC, I'll check it all out, and return with the results :-)

That sounds more like you set the Nuendo to a wrong clock state - Internal clock, which then requires the RayDAT to be set to ADAT sync mode.

There is a clear labelling on the unit that says 'Input' for both AD/DA, and a white line that leads to 'ADAT'. Can't be more clear, IMHO.

If you don't have the manual for that unit download the one from RME's website, product ADI-8 DS.

Clock setups are clearly explained in all manuals, with the most important statement highlighted: 'there can be only one clock master'.

Firmware Update 16 can stay in the RayDAT, it will become official sooner or later anyway.

Hey guys,

I think I'm starting to get the grip of how the sync settings works. I've never really thought much about it, since it just worked on my old HDSP 9652 setup.

What I've found out, please correct me if I'm wrong:

My Nuendo 8 I/O has 3 sync settings: Input, Ext. and Int.
It's also has the ADAT / TDIF switch, where I naturally use ADAT.

I found out - looking at the Nuendo top plate diagram, that "Input" sync on AD/DA should be used, when receiving sync from an external device, like the Raydat, correct?

And the External sync, is working with an Wordclock, which I don't use.

And the final setting "Internal", is when the Nuendo is the sync source for - in my case,  the Raydat, correct?

-------

On the Raydat I have switched between - internet and ADAT1 sync, 44.1 khz. Then I can see on the Raydat driver input status, when there is sync, and to what it is syncing. In my case to ADAT.

-------

So the new setting I'm using, is setting the Raydat up for "internal" sync. I guess then the Raydat act as sync source to the Nuendo AD/DA converter. This didn't work out good (random sync clicks), when I selected ""internal" on the Nuendo converter.
I guess the Raydat was putting out sync as source, and the Nuendo converters was also acting as sync source, is that correctly?

Now the new thing is, that  I only selected the "input" sync  on the Nuendo converters. I guess that the Nuendo then acts as  a slave to the Raydat?!
At least, I don't have any clicks in the audio path, unless I select a 32 sample buffer, and still playback music from windows 10 media player, then I hear clicks. I don't think I hear anything in Cubase, but I'll check it out again in Cubase.

To sum up, what works:
- Raydat "internal" sync, 44.1 khz, ADAT1  ---->  Nuendo  AD/AD "input" sync (works out fine, I guess the Raydat is source)
- Raydat "ADAT1" sync, 44.1 khz, ADAT1  ---->   Nuendo AD/DA "int" sync (work out fine, I guess the Nuendo is source)

Is this correct, and when sync device is best. I would think, that the Raydat as source is best, or?

Strange, that I'm getting clicks with a 32 sample buffer, playing back music in Win10 media player. Is that because the audio patch goes through Win10 audio layers, before it arrive to the kernal mode?

Thanks Daniel,

Yes, I know I have to have a word clock device / board, to be able to sync more digital devices.
But I also only have my Nuendo 8 I/O on ADAT1 + my old Finalizer 96k on ADAT2 (not connected now though)

So I think it should be fine to use the Raydat as master, and the Nuendo as slave. And I think I have managed to
set it up correctly now.

I'm in doubt, if I should use the Raydat as master, or my Nuendo AD/DA converter as master. Which clock device is
best, if there is any different. The Raydat is newer that my old Nuendo converts, so the clock output could maybe
be better on the Raydat?

I've tried both ways, and I can't hear any different between the Raydat as master, and the Nuendo as master. But
some of you guys might now something else, have better ears than me :-)