This bugs seems to be similar to Debian bugs #638691 and #638369.
Ubuntu 11.04 shipped with alsa-utils 1.0.24 which introduced the pause 
functionality to
aplay (part of alsa-utils). This is consistent with the version of alsa-utils 
also breaking festival in Debian.
Upstream alsa project has a patch in their master to fix this change in aplay.
I have tested this patch on a broken festival Debian system and it restored the 
functionality.
Would an affected person be able to test this on Ubuntu?

I attach the patch which was added at the upstream alsa project by Takashi Iwai.
His discussion can be found at

http://permalink.gmane.org/gmane.linux.alsa.devel/85332

very best regards,
Peter
(Co-Uploader for festival on Debian as of last week)

** Patch added: "Potential patch requires testing on ubuntu 11.04 alsa-utils"
   
https://bugs.launchpad.net/ubuntu/+source/festival/+bug/778619/+attachment/2304747/+files/alsa-aplay-interactive-patch.diff

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https://bugs.launchpad.net/bugs/778619

Title:
  Festival TTS starts 'paused' for blocks of text

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