I used those chips a very long time ago. Never solved some of the problems, like unacceptable clicks at the end of the message phrase. Gave up eventually.
Next project where I needed speech output, just used an AVR, 8 bit DAC, and SD card for storage of the WAV files. Works really well. Storage could also be done using the AVR ADC for input, but we never needed that, all our messages were 'canned'.
Do a search on this forum and the Bascom AVR archive for "speech", there has been plenty of discussion.
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