member of audio group cant access /dev/dsp to play sound
===

I'm trying to play a tone with python using the following script referenced here:
http://forums.xkcd.com/viewtopic.php?f=11&t=49360

    python -c "freq=220;sec=2;from math import sin,pi;rate=8000;w=                 
    [chr(127+int(127*sin(i*2*pi*freq/rate))) for i in     xrange(rate)]*sec;s=''.join(w);print s" >/dev/dspi in      
    xrange(rate)]*sec


I get a permission denied error 
/dev/dsp: Permission denied

I am root and my user is a member of the audio group.
Is there something I am missing? I am using ubuntu 11.04
