yep it can be done, I`m justy so you have to work out the fine point your self
first have spk: mounted
then its just a matter of copying a txt file to it
copy hello.txt > speak: --- Bin copy so probably sound crap
or
type hello.txt > speak:
or
Echo Ribbit > Speak
well thats all I can remember at moment, it may all be bolloks or it might just work
fingers crossed and er pictures er no sounds or it did`t happen
Good luck dude