On 10 Jan 2014 16:30, "Kees van Veen" <kees.vanveen@gmail.com> wrote:

[James Stone]

Thanks for testing this.. Quite weird - so you are getting crackles
even at 1024x3!!? That sounds really odd and definitely an
unacceptable performance. I have definitely not heard anything like
this on my device. I wonder if it is some kind of hardware fault. Are
you able to test it on a mac or windows comupter?

No such systems around here, so that's unlikely to happen.  I might be
able to try it one of these days on different linux USB host hardware,
we'll see.

Not sure if it has anything to do with it, but I experience 'static' crackles on my Presonus 1818 as well.

Have to try my old laptop still, but on my new one the crackles sometimes coincide (from watching tail -f) with

    kernel: [12263.813466] usb_submit_urb: -16

in the syslog/kern.log, and an occasional

    kernel: [12261.509328] retire_capture_urb: 2 callbacks suppressed

Do you have that as well ?

I'm on Ubuntu 13.10 / 3.11.0-15-lowlatency.

Thanks,
Kees