The game doesn't have NVDA support. To increase the SAPI speed, press N. To decrease it, press B. You will have to readjust it every time you open the game. Also, are you having the same problem I am with the game ware when I save it, the game makes a .sgi file?
If you want to change the voice, follow these steps. Note: this will only work if you have Windows 8 or 10, I think. Haven't tested it on 7 or Vista. Also, this was done on a 64 bit computer.
1: go to Windows, SysWOW64, Speech, SpeechUX and press enter on sapi.cpl.
2: choose a voice, all of them will appear.
3: change the speed if needed and press OK. It won't work with Narrator, but it will with anything that uses SAPI.
Barren Byron used Nature Overdrive!