[LAU] USB2 Audio, PreSonus Audiobox 1818VSL -- was: Sound Devices USBPre2, UAC2 status

[Louis Gorenfeld]

Hi,
  There are some glitches in the current ALSA (1.0.25) implementation
of UAC2, at least when used with the 1818VSL. It does mostly work (in
UAC2 mode, too). What I have noticed, aside from the click, is this:

- The sample clock selector doesn't work by default. I made a patch
that addresses this:
http://mailman.alsa-project.org/pipermail/alsa-devel/2013-January/058141.html

- The mixer control names are all prefixed with "AudioBox 1818 VSL
Clock Selector" (which is the name of the first control)

- Note that there are two mutes in the mixer-- one per-channel and one
master mute. The same is true of input muting. If you're not hearing
anything, check this first.

- Don't turn it off when an audio stream is processing or it'll risk a
kernel panic. Or, at least, that has been my experience.

- There appears to be a general compatibility issue with i7 and the
PreSonus (cross-platform; it'll happen on Windows too). I believe this
is a known bug that is being addressed. This manifests as a subtle
click once a minute or so, from the machine I tried it on.

Lemme know how it works out for you!

-Louis

On Fri, Jan 11, 2013 at 7:32 AM, Robin Gareus <robin at gareus.org> wrote:
> On 01/11/2013 04:26 PM, Hans Wilmers wrote:
>> On 01/04/2013 08:31 PM, shal at free.fr wrote:
>>> Hi,
>>>
>>> Some old posts exist about the UAC2 support for the Sound Devices
>>> USBPre2 but some problem remains.
>>> The current status is that this sound card is supported as a USB 1.1
>>> card in high-speed mode.
>>> But this card is not seen as a Usb Audio Class 2 on  Linux. On Mac OS
>>> X this card is recognized as UAC2.
>>>
>>
>> I have access to a PreSonus Audiobox 1818VSL today, and it gets
>> instantly recognised with 18+18 channels. I tested the analog inputs and
>> outputs, and these work fine with up to 24/96.
>>
>
> It is known to work well under GNU/Linux:
>
> http://wiki.linuxaudio.org/wiki/current_audio_gear#presonus_-_1818vsl_usb2
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