The `festival` text-to-speech synthesizer seems to use normal ALSA playback instead of PulseAudio. This leads to it
failing when there's already something playing. E.g. if you're listening to music with *Rhythmbox*, *festival* fails
with this message:
Linux: can't open /dev/dsp
To make it use PulseAudio, we can re-route the audio through the `pacat` utility as proposed on [this bugreport](https://bugzilla.redhat.com/show_bug.cgi?id=467531).
Just add these few lines to your `/usr/share/festival/init.scm`: