Bugreport by Michael Whapples (thanks!):

I am unable to use speakup with a hardware apollo synthesiser. In
the file listing the cheat codes for GRML 2008.11 it says that the
option should be of the form speakup_synth=synthname, so I enter
the following command (it includes a brltty option for my Braille
display):

grml brltty=al speakup_synth=apollo
The Braille display works but no speech comes out.

I know that for speakup 3.0.x the options normally are of the form
speakup.synth=synthname (in the main the _ character is replaced
with the . character). So I tried booting with the following line:

grml brltty=al speakup.synth=apollo

Again Braille works but no speech. Once the system is booted if I do:
modprobe speakup_apollo
speakup will start.