The talk button needs setup first. Open Setup and record each phrase three times. Typing below works right away.
Tap, say one of your phrases, then wait.
You said
Not right? Tap the one you meant
Phrases
Tap one to say it out loud.
Say this phrase
Say it the way you normally would.
Setup
Each phrase needs three recordings before the talk button can recognise it. The more you record it, the better it gets.
Voice and backup
Recordings are turned into number patterns and kept only on this iPad. No sound is saved or sent anywhere.