1. You can upoload screenshots on imgur.com and copy the bbcode which you can paste in your post.

2. Make sure you have set your optical out to ADAT instead of S/PDIF in Settings. I don't know if UFX have that option, mine does and ADAT and S/PDIF are using the same connector.

Hi both,

Thanks for the reply.

what are your USB Fireface settings ?

Clock-mode internal ?

internal

digital setting adat or spdif ? Set it adat.

adat

What is the sample rate in this settings program and what is selected in Logic ?

48

are there any settings on this Octopre, some dip switches ? sample rate settings ?

48 on Octpre

If your sample rate is 96 or higher then the adat channels are only 4 not 8, then the channels 15/16 no longer exist.

You can see the outgoing signal in Totalmix but no return on adat 15/16.

yeah, that's right

The rest of my set up is fine, everything is clocked correctly, numerous synths etc work fine. but as soon as I try and use an external effect connected via an interface (eg Octopre) via adat I get get no input signal.

Ive also just bought a Ferrofish and Digiface. Ive unplugged everything else and just have these two connected to my iMac in Logic. Ive connected an external effect to the Ferrofish and hooked it up via Logic's I/0, but I'm getting exactly the same issue- no input signal is hitting the Ferrofish.

No signal is showing on the Octopre

Yeah, its set at 12

I have a couple of synths also plugged in into the Octopre and they work fine.

Just connected one, synth works fine, with signal showing on Octopre

I am lost.
We must go back to the roots.
What exactly is the issue ?
When all adat channels works fine then the effect unit also receives the signal and sends back the effect signal.
Logic output and input have to be selected and Totalmix is the place to watch all signals incoming and outgoing.
And then also a total reset in Totalmix could help in case you did mess in Totalmix...?

weird that it works fine with a synth plug in though and shows a signal

When I turn the effect on and off and it show a burst of a signal, on both on the octopre and in totalmix

@ramses: thanks for your reply

Your 1st screenshot shows the submix for the relevant HW Output ADAT 9/10. These channels are the first two of UFX's ADAT2 port. So this should match with the first two analog outputs of the Octopre which should be connected to the Alesis Quadraverb's analog inputs. Did I understand the cabling correctly ?

yes, thats correct.

The second screen shot was just to illustrate how I got a different effect to work. you can prob ignore it.

Ive attached two screenshots of the current situation.

Ive simplified the issue. Only one track is active in Logic, which has the I/O plug-in pointed at the inputs and outputs of the Quadraverb. Audio is also now running.

First screenshot is the HW Output 9/10 submit, the other is the for the Main page.

I have a basic understanding how to create a submix, as I successfully added other hardware defects to my set-up. I'm struggling to understand why there is not input signal coming into the 15/16 channel though in this instance.

Can you please check, whether you forgot to configure the routing on the Octopre ?

In the Focusrite manual you find the information that you need to activate "ADAT-to-Line-Modus" on the front of the device.
Only in this mode you route from ADAT to Line Outputs.

In terms of clock synch: "Scarlett OctoPre Dynamic as a clock slave via ADAT: Connect the ADAT OUT port(s) of the Scarlett OctoPre Dynamic to the ADAT input of the receiving receiving digital device. Connect the ADAT output to one of the ADAT IN ports on the Scarlett OctoPre Dynamic. On the OctoPre, SYNC must be set to ADAT and the -LED should be lit. Make sure also make sure that the sampling rate is set identically on both devices."

OK ADDA mode is set.
But I think I see a mistake ... clock source is set incorrectly on the Octopre.

if I am not mistaken you wanted to have the UFX as clock master, but I see here the LED red at clock mode "internal".

You need to set clock source to "ADAT".
If clock synchronization is not proper then the whole communication will most likely fail.

@ramses

when I set it to adat I don't get a lock though, and I get no input signal l when turn the QV on and off in this mode.

my Fireface settings

@waedi

"yes the synth works fine but that is not the way you need signal flow for having effect signal from the QV"

does a synth working not suggest adat is working fine though?

Yes, it does not confirm that everything is fine, it does only confirm half of the story.
The one way from synth to the computer works but the other way can be out of order.

The two adat devices can not have both internal clock.
One must set external adat.

Everything solved ? What was the root cause ? Wrong clock source at the Octopre ?

Only one device can act as clock master (clock source = "internal").

All other devices need to be clock slave and get the clock signal through a digital input like ADAT to be able to lock and synchronize on the proper sample rate.

The recording interface (UFX) is the ideal candidate in your setup to act as clock source, because then all connected clock sources can learn the clock automatically.

So to have the recording interface as clock master is the most comfortably solution, because then you need only to set the sample rate in the project settings of your DAW project. This will instruct the driver to set proper sample rate on the recording interface and all clock slaves will learn this automatically.

Finally 78 postings to find this out, oh dear What did old friends / IT colleagues always tell .. "check cables and connectors" .. and for such setups also clock. Next in turn -> routing.