Well, that's a step in the right direction. I didn't try editing the configuration
file, but I did prepend padsp to the commands.
Result:
padsp espeak -f file.txt does not work
padsp festival --tts file.txt does work (but not within kttsd, only on the command line)
Although festival within kttsd is of the utmost importance, it would be nice, were espeak
to work, too, as it is able to make use of the mbrola voices, enabling rendering of French
and German, too.