Public bug reported:

Binary package hint: pulseaudio

The switch to pulseaudio has made screen readers, on which the blind
depend, unintelligible.

The recommended workarounds are, in this order:
* aptitude remove pulseaudio
* touch ~/.pulse_a11y_nostart
* Use orca with pulseaudio via speech-dispatcher: 
http://live.gnome.org/Orca/UbuntuJaunty

The problem appears to revolve around pulseaudio's lack of support for
mmap, and libportaudio's dependancy on it:

$ LIBASOUND_DEBUG=1 espeak "This is a test."
ALSA ERROR hw_params: set (ACCESS)
           value = MMAP_INTERLEAVED : Invalid argument
...


$ lsb_release -rd
Description:    Ubuntu 9.04
Release:        9.04

$ apt-cache policy pulseaudio
pulseaudio:
  Installed: 1:0.9.14-0ubuntu20.2

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Ubuntu's switch to pulseaudio broke accessibility for the blind.
https://bugs.launchpad.net/bugs/416101
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