audio_play on turtlebot: messages being sent, but no audio output

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Hello,

I'm trying to get audio streaming back from my turtlebot and was delighted to find the audio_common package which provides audio_play and audio_capture. Sadly, it doesn't seem to be working.

I'm following the tutorial found here: http://www.ros.org/wiki/audio_common/Tutorials/Streaming%20audio

Setup

• On my turtlebot, I installed sound_common with "apt-get install ros-electric-sound-drivers"
• My microphone and speakers are configured correctly, I'm able to record and play back sounds.
• The command to test my audio setup works. It echos sounds from the microphone.

gst-launch-0.10 alsasrc ! audioconvert ! audioresample ! alsasink

• I launched both audio_capture and audio_play as per the tutorial

$ roslaunch audio_capture capture.launch
$ roslaunch audio_play play.launch

Problem and Troubleshooting

• No sound output.
• Both scripts launched without error.
• I've verified that the nodes are connected using rxgraph
• "rostopic echo audio" streams audio messages.
• I can see the microphone input level bouncing, but the output level is doing nothing.
• I've used sound_play to verify that I can play sounds and my volume settings are correct.

From what I can tell, everything should be working. But I still get no output. Any ideas on how to troubleshoot this?

Thanks,

-Brian