Multi output device doesn't work on OSX

oliver

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Hello John,
I am under High Sierra OSX 10.13.6, REW last version and build, 5.20 Beta 15.
I have created a multi output device but REW give me back this message:

.Schermata 2019-07-09 alle 09.30.40.png

Just for information, multi output devices never worked on REW, but works on some other software.
Thank you,
Best regards.
 

John Mulcahy

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Can you attach the soundcard debug file REW generates when you have a multi output device configured? Use the Generate debug file button on the Souncard preferences to generate it.
 

John Mulcahy

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Which devices are in the multi output group? Is drift correction selected for the slave device(s)?

Edit: there doesn't seem to be a fundamental issue with multi-output devices, I created one from the built-in output and a USB soundcard and REW worked normally using the multi output device.
 
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oliver

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Hi John,
here a screenshot of what inside the multi output device:
Schermata 2019-07-09 alle 14.37.09.png

Just two focusrite Scarlett, on my side doesn't work, maybe is the drift correction?
 

oliver

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Ok,
checked with one Scarlett and the default audio card on my mac and it works, if I put the two USB Scarlett it doesn't.
 

John Mulcahy

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Odd. What clock rate was the multi output device set up for? How about if you make a device with the built-in output and the two Scarletts?
 

oliver

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the sampling rate was 44.100KHz. With 2 Scarletts and the built-in output together doesn't work, same message.
 

John Mulcahy

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Worth trying with a different sample rate when creating the multi-output device, 48 kHz perhaps, but I'm only guessing at what might help, sorry.
 

oliver

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tried with all the sampling rate, same error,
As a possible helpful information, with Smaart live works well.
 

John Mulcahy

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I'm presuming you are seeing the message when you turn off the signal generator? It may be safe to ignore it.

Have you tried making a sweep measurement?
 

oliver

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Yes the message appear whe I turn off the generator.
If I make a sweep measurement the generator get stuck:

Schermata 2019-07-09 alle 15.07.19.png
 

John Mulcahy

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There might be an error message in the log files from the sweep measurement attempt, they are in the REW folder in ~/Library/Logs. I'm not sure how I could go about fixing this though.
 

John Mulcahy

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No clues there, sorry, other than an attempt to show too many error messages if the output can't be written to - I've fixed that but I have no idea why the multi output doesn't work with two USB devices.
 

oliver

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Hi John,
Sorry to reply so late.
No worries, I will find a workaroud.
Thanks for trying.
Best regsrds.
 
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