It looks as though pr1.5 is using pulseaudio 0.9.15 which is still unable to communicate with 0.9.21.

0.9.15 is in lenny-backports so I'll see if I can get sound out of the chroot when I have time.

I don't know if it is interesting but I tried installing mpd in the chroot and could get sound out by selecting alsa output on hw:0,0 but there was no way for me to control the volume through mpd or maemo.