On Tue, Dec 19, 2017 at 11:58 AM, Len Ovens <len@xxxxxxxxxxxxx> wrote:
On Tue, 19 Dec 2017, Len Ovens wrote:
I have not seen in this thread any meantion of the web interface that the motu AVB series interfaces normally have, so I am guessing this is not one of these boxes. Motu's support in the past with Linux has be notoriously bad until the AVB series, so you may have something that will not work with Linux properly... as in, it is USB2.0 compliant so far as sound transfer is concerned, but expects a provided blob to do device setup. The AVB series uses a web based setup tool that is OS agnostic.
Sorry it says AVB right in the subject. I missed. Do not trust alsa to set the sample rate, use the web based setup tool for that. Make sure that alsa and the web setup are the same. make sure the web setup shows a reasonable sync source.
ALSA can set it. But it is *slow* to be set. JACK (1) will typically fail the first time you start it with a different SR than the current AVB setting because the device appears to fail to respond. Second time it will be fine (because the SR change has finally happened).
The bigger problem with the Ultralite AVB (for me) has been that the capture channels get remapped semi-randomly in blocks of 8 (e.g. input channel 1-8 can be remapped to be input channel 8-16 etc.) It doesn't happen except at device open. It is likely an ALSA driver problem and can probably be solved relatively easily with a USB quirk, but I have not found the time or inclincation to fix it because I'm not doing any recording with it.
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