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
plugin...
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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