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@xxxxxxxxxx> wrote: > On 01/11/2013 04:26 PM, Hans Wilmers wrote: >> On 01/04/2013 08:31 PM, shal@xxxxxxx 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 > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
