MUTOOLS

u!Z7 · Post by **u!Z7** » Thu Aug 06, 2020 9:02 pm

If I switch back to built-in output, it works.
Has anybody had this problem?

mutools · Post by **mutools** » Thu Aug 06, 2020 9:31 pm

I assume that's on Mac, right?
It seems that some devices are reporting to have no audio outputs.
In that case MuLab cannot run, it needs at least 1 audio output.

u!Z7 · Post by **u!Z7** » Fri Aug 07, 2020 6:58 am

It's on Mac, yes.
It's lot really an issue, but good to know the cause - thanks.

mutools · Post by **mutools** » Fri Aug 07, 2020 7:33 am

Just a double-check:
When you have selected your usb headphone in MuLab right-click the cpu meter (in the transport panel, right to the metronome) -> audio engine stats. I assume it says Num Outputs = 0, right?

u!Z7 · Post by **u!Z7** » Fri Aug 07, 2020 12:16 pm

Num Outputs = 0, yes.

mutools · Post by **mutools** » Fri Aug 07, 2020 12:55 pm

Well that's the very issue then. MuLab asks the headphone driver how many outputs it has and the headphone driver answer is 0. Weird.

u!Z7 · Post by **u!Z7** » Fri Aug 07, 2020 1:19 pm

I would say - bad headphones.
Maybe a user friendly message like "The selected output device does not provide any outputs" or so?

Michael L · Post by **Michael L** » Fri Aug 07, 2020 2:07 pm

Try creating an Aggregate Device:
https://support.apple.com/en-us/HT202000
MuLab will recognise it in Audio Setup.

u!Z7 · Post by **u!Z7** » Fri Aug 07, 2020 3:18 pm

Ok, I tried that: the audio engine starts and sound only comes out of the other(, non-USB-C headphone device) of the aggregate device.

MUTOOLS

KVR Audio

if I plug in my USB-C headphones, the audio engine cannot start