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Thread: crackling audio External USB DAC

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hi,

trying audio stop crackling in ubuntu 11.10. outputs external usb dac , seams dropping bits or something.

have been trying fix using pulseaudio setting , alsa mixer settings no avail.

crackling occurs when no music playing, during playback, , when open new terminal window. odd.

appreciated.

here excerpts pulseverbose log. please me.

( 0.000| 0.000) i: [pulseaudio] main.c: setrlimit(rlimit_nice, (31, 31)) failed: operation not permitted
( 0.000| 0.000) i: [pulseaudio] main.c: setrlimit(rlimit_rtprio, (9, 9)) failed: operation not permitted
( 0.000| 0.000) d: [pulseaudio] core-rtclock.c: timer slack set 50 us.
( 0.015| 0.015) d: [pulseaudio] core-util.c: realtimekit worked.
( 0.015| 0.000) i: [pulseaudio] core-util.c: gained nice level -11.
( 0.015| 0.000) i: [pulseaudio] main.c: pulseaudio 1.0
( 0.015| 0.000) d: [pulseaudio] main.c: compilation host: x86_64-pc-linux-gnu
( 0.015| 0.000) d: [pulseaudio] main.c: compilation cflags: -g -o2 -g -o2 -wall -w -wextra -pipe
( 46.927| 0.000) d: [pulseaudio] protocol-dbus.c: interface org.pulseaudio.core1.memstats removed object /org/pulseaudio/core1/memstats
...
( 46.927| 0.000) i: [pulseaudio] sink.c: freeing sink 0 "alsa_output.usb-burr-brown_from_ti_usb_audio_dac-00-dac.iec958-stereo"
( 46.927| 0.000) i: [pulseaudio] source.c: freeing source 0 "alsa_output.usb-burr-brown_from_ti_usb_audio_dac-00-dac.iec958-stereo.monitor"
....
( 46.928| 0.000) i: [pulseaudio] module.c: unloaded "module-dbus-protocol" (index: #21).
( 46.928| 0.000) i: [pulseaudio] module.c: unloading "module-switch-on-port-available" (index: #22).
( 46.928| 0.000) i: [pulseaudio] module.c: unloaded "module-switch-on-port-available" (index: #22).
( 46.928| 0.000) i: [pulseaudio] module.c: unloading "module-null-sink" (index: #23).
( 46.928| 0.000) d: [pulseaudio] core-subscribe.c: dropped redundant event due remove event.
( 46.928| 0.000) d: [pulseaudio] core-subscribe.c: dropped redundant event due remove event.
( 46.928| 0.000) d: [pulseaudio] core-subscribe.c: dropped redundant event due remove event.
( 46.928| 0.000) d: [pulseaudio] core-subscribe.c: dropped redundant event due remove event.
( 46.928| 0.000) d: [null-sink] module-null-sink.c: thread shutting down
( 46.928| 0.000) i: [pulseaudio] sink.c: freeing sink 1 "auto_null"
( 46.928| 0.000) i: [pulseaudio] source.c: freeing source 1 "auto_null.monitor"
( 46.928| 0.000) i: [pulseaudio] module.c: unloaded "module-null-sink" (index: #23).
( 46.928| 0.000) d: [pulseaudio] core-subscribe.c: dropped redundant event due remove event.
( 46.928| 0.000) i: [pulseaudio] main.c: daemon terminated.
[/code]


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