Recording with Alesis IO/2, what about the "noise"?

[Timothy Cook]

Mine too was on the hardware monitor.  Yes, I am quite sure it is a setup
issue.  I returned my first unit thinking it was a hardware problem.  The
second one did the same thing.  So I started working on the setup.  One
thing I believe helped was the sample rate in JACK defaults to 44100Hz.  The
Alesis samples at 48000Hz. I am on a new installation of Natty right now but
here is JACK setup that works for me:

/usr/bin/jackd -dalsa -r48000 -p256 -n2 -D -Chw:1,0 -Phw:1,0

HTH,
Tim



On Fri, Mar 18, 2011 at 9:11 AM, Giuliano Braglia <forevergyl at gmail.com>wrote:

>
>
> 2011/3/17 Thomas Orgis <thomas-forum at orgis.org>
>
>> Am Thu, 17 Mar 2011 13:31:23 -0500
>> schrieb Timothy Cook <timothywayne.cook at gmail.com>:
>>
>> > I have this device as well.  When I first used it I had the same issue.
>> > Playing around with the settings in QJackCtl finally eliminated it.
>>
>> Hm, I don't remember such an issue. I do remember ground loop noise
>> induced with the help of the laptop's crappy wiring, but that did not appear
>> on recordings and was also helped by exploiting the balanced outputs (ground
>> lift).
>> But what I can imagine is that the input gain is set too high -- noise
>> characteristics of amplifiers are not best at full tilt. When JACK settings
>> fix it ... then it's a weird side effect of the driver, certain period
>> setup? Funny.
>>
>
> Actually, my noise could not be related to JACK, because it is present even
> without it, when I listen through the direct monitor.
>
> You think that I should also check if my pc is properly wired with the
> ground lift?
>
>
>
> --
> Ubuntu-Studio-users mailing list
> Ubuntu-Studio-users at lists.ubuntu.com
> Modify settings or unsubscribe at:
> https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-users
>
>


-- 
================
Timothy Cook, MSc
Project Lead - Multi-Level Healthcare Information Modeling
http://www.mlhim.org

LinkedIn Profile:http://www.linkedin.com/in/timothywaynecook
Skype ID == timothy.cook
Academic.Edu Profile: http://uff.academia.edu/TimothyCook

You may get my Public GPG key from  popular keyservers or
from this link http://timothywayne.cook.googlepages.com/home
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-studio-users/attachments/20110318/4f60b8be/attachment.html>