Justin Smith wrote: > On Tue, Jan 13, 2009 at 12:53 AM, david <gnome@xxxxxxxxxxxxx> wrote: >> Is it normal for it to have more-or-less constant low-frequency pops and >> crackles while playing quiet passages, and occasional louder pops even >> in louder passages? These are files that were digitally generated >> (sample recordings of the Aeolus organ synthesizer) or ripped from CDs, >> so they weren't analog recordings that might have such additional >> natural sounds. >> > Try the "test audio and midi" menu item in puredata, with the test > signal on the "-40" setting (or some other low level reference signal > of your choosing). If you get the same low frequency pops and static, > it is your sound card or driver (most likely the card). From your > description it could be a ground loop - does it go away if the sound > card is attached to a laptop on battery power? Thanks for the suggestion about it being a ground loop. I tried it at home here with the laptop on battery power - with no change. At my office, there was no noise problem at all. The difference is that at home I was plugging the card into an powered external USB hub (ZoneNet 7-port USB2). I reshuffled USB connectors to give the sound card its own USB port and the noise went away. Lovely sounding card - amazing how the Intel HDA sound chip makes the sound muddy, murky and distorted ... -- David gnome@xxxxxxxxxxxxx authenticity, honesty, community _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
