[LAU] Problem with Lexicon Omega USB-Audio device
susemuse27 at gmx.de
Sun Jun 17 09:04:36 EDT 2007
hi, thanks for answering, no, the crackling does not occur everytime,
this seems to depend on the system load - I'm able to run smooth
recording sessions using two stereotracks in Ardour with one reverb
but last night I learned from the internet - mainly from the listhistory
- that things are obviously some more complex to determine - inter alia
stability of audioprocessing also seems to be a question of interrupt
settings and priority - so I fear my question just can't be answered in
that simple way I would wish - thank's anyway :-)
Johannes Mario Ringheim schrieb:
> Susanne Schneider wrote
>> using two of four possible inputs with jack I'm able to run my
>> standard apps like Ardour, Rosegarden, Hydrogen, Bristol, Qsynth with
>> a minimal latency of 128 Frames/Period and 4 Periods/Buffer at 44100
>> Hz (=11,6 ms) without xruns -
>> BUT(!): sometimes (seems to depend on the extend of use of plugins
>> and synths), during recording after some minutes from the start an
>> increasing crackling-noise occurs which makes my record unusable -
>> jack reports no xruns at all!
> i had a similar problem with an sblive, it started crackling like you
> describe each 30 min or so depending on the jack settings. a post to
> the jackdevel list revealed that the card was really working at 48kHz
> all the time, and resampling in the case of 44, 22 or any other sample
> rate. so, does the crackling occur periodically? if so, you might want
> to try with 48, 96 or some other sampling rate.
>> I then have to stop and close my apps, restart jack and start all
>> new... a tedious biz...
>> Searching the Internet I learned that my Audiocard may not be
>> "devicecompliant" in terms of USB - whatever this means.
> afaik the linux kernel supports any "devicecompliant" usb card, so if
> it's not there's a fair chance you'll have problems.
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