Speak doesn't release audio device properly

[pgf]

this activity doesn't release the audio device when not using it. this will prevent an XO laptop from suspending properly, and may even prevent other programs from using the audio device.

this command can help observe that the activity is doing the right thing:

    while sleep 0.1
    do  
        egrep 'closed|state' /proc/asound/card0/pcm0p/sub0/status
    done

the output should be "RUNNING" while noise is being made, and "closed" when not.