What distribution will work with the virtual machine on a Mac?

[Linux for blind general discussion]

This question brings up another fortified by a discussion  on the freedos 
list.
someone has built a talking edition of freedos run in a virtual 
environment using the ASAP dos screen reader and the Braille & speak 
synthesizer  via emulator.
Have any other synthesizer voices been written to be emulated dubbletalk or 
dectalk for example?
Surely  braille and speak is not the only one.