Here's a selection of different methods for saying the word "Acorn".
First is using the SOUND command, with -1 meaning hex &FFFF, meaning speak word number within Phrase ROM &F, or &FFBF, meaning speak from a memory location in the PhROM, and then using my own utility methods of loading the location into the speech processor and speaking from there, with a couple of alternative procedures.
Don't forget to click in the middle of the picture above to play the video!