3 Aug
2009
3 Aug
'09
7:22 p.m.
my config:
Dell Studio
Ubuntu 9.04
rt kernel 2.6.29.4-rt15-rt
jackd version 0.116.1 tmpdir /dev/shm protocol 24
Ardour 2.7.1 (built from revision 4296)
USB iMic audio interface
KOrg nanoKontrol
cpufreq-set - both cpu's are set to 2.0GHz and userspace
I'm trying to get Jack and Ardour set up/optimized for my fall tour
I'm using the rt kernel as stated above
my Jack settings are 44.1kHz: frames 512: periods 5
latency is not a huge issue for me since I'm only playing back audio for
a live mix situation
and xruns in Jack seem to be tamed to 0 during playback
my Ardour session is 30 minutes in length, has 8 tracks of audio, and
the fader levels are assigned to the nanoKontrol
everything works fine for the session except at some random point after
playing for a while I get a single short burst of AM sideband noise,
like I'm multiplying the audio on the mix buss by another audio signal
it doesn't happen (so far) more than once per session and it doesn't
seem to be correlated to anything like mix buss levels or clipping on a
single channel etc
is there a setting in Jack that I'm overlooking or has anyone
experienced a similar intermittent burst of noise in playback with
similar Jack settings? or if this topic has already been discussed can
someone point me to a link in the archives? I wasn't able to find
anything on a cursory search
This could be one of several issues.
1: A driver bug.
2: A bug in the version of Ardour that you are using.
3. It may be related to having a daemon process running that spikes your
load.
To check for the latter you would need to run a monitoring app like
gkrellm or top and monitor it while you have the session playing to
check if any spikes occur. It's probably also possible to print a status
report to stdout so you can check back.
If it's a driver, jack or Ardour bug I haven't heard of it. IMO if it's
not an external process causing the spike it's a 50/50 chance it's
more the driver for the imic than a bug in the version of Ardour.
If you can rule out the spike option that would be helpful.
Cheers.
Patrick Shirkey
Boost Hardware Ltd
================
-- also, I started Ardour from command line when Jack wasn't running
and I got three panels in the open dialog box -- one of them being a
Audio Setup panel
-- is there a way to see this panel after starting Ardour with Jack
already running?
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user