I have a Beaglebone Black running Angstrom 3.8.13 connected (through USB) 
to a Burr-Brown PCM2900C CODEC. I can setup loopback with alsa, but not 
pulseaudio.  The command is accepted, but the audio isn't looped back.  The 
commands I'm using are:

alsaloop  -C hw:1,0 –P hw1:0 –t 50000 –T 1 (which works), and

pactl load-module module-loopback 
source=alsa_input.usb-BurrBrown_from_Texas_Instruments_USB_AUDIO_CODEC-00-CODEC.analog-stereo
 
sink=alsa_output.usb-BurrBrown_from_Texas_Instruments_USB_AUDIO_CODEC-00-CODEC.analog-stereo
 
latency_msec=50 (which doesn't work)

When I run the same pactl command on my laptop, running Fedora 19, it works 
fine.

I have the following modules installed on the Beaglebone:


   - pulseaudio - 2.1-r9.16
   - pulseaudio-doc - 2.1-r9.16
   - pulseaudio-lib-alsa-util - 2.1-r9.16
   - pulseaudio-lib-protocol-native - 2.1-r9.16
   - pulseaudio-module-alsa-card - 2.1-r9.16
   - pulseaudio-module-alsa-sink - 2.1-r9.16
   - pulseaudio-module-alsa-source - 2.1-r9.16
   - pulseaudio-module-always-sink - 2.1-r9.16
   - pulseaudio-module-augment-properties - 2.1-r9.16
   - pulseaudio-module-card-restore - 2.1-r9.16
   - pulseaudio-module-console-kit - 2.1-r9.16
   - pulseaudio-module-default-device-restore - 2.1-r9.16
   - pulseaudio-module-detect - 2.1-r9.16
   - pulseaudio-module-device-restore - 2.1-r9.16
   - pulseaudio-module-filter-apply - 2.1-r9.16
   - pulseaudio-module-filter-heuristics - 2.1-r9.16
   - pulseaudio-module-intended-roles - 2.1-r9.16
   - pulseaudio-module-loopback - 2.1-r9.16
   - pulseaudio-module-native-protocol-unix - 2.1-r9.16
   - pulseaudio-module-null-sink - 2.1-r9.16
   - pulseaudio-module-position-event-sounds - 2.1-r9.16
   - pulseaudio-module-rescue-streams - 2.1-r9.16
   - pulseaudio-module-role-cork - 2.1-r9.16
   - pulseaudio-module-stream-restore - 2.1-r9.16
   - pulseaudio-module-suspend-on-idle - 2.1-r9.16
   - pulseaudio-module-switch-on-port-available - 2.1-r9.16
   - pulseaudio-module-udev-detect - 2.1-r9.16
   - pulseaudio-server - 2.1-r9.16
   
I'd like to use pulseaudio because of the added flexibility over alsa.  Can 
anybody tell me what's wrong?

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