With FN (FujiNet) you can now let your Atari speak. The Software Automatic Mouth (SAM) is implemented in FN as the P: device. Note: requires a XL/XE system.
PRINT #1;"HELLO FROM SAM"
There is video showing the details of this implementation:
There is a lot more programming info and how to use phonemes on the FujiNet SAM Wiki page: