> > 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@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
