However, on looking through some items in Tiger 10.4.11, there
may be a setting in another location; I've never had keys speak.
But do know such settings exist, to aid those with disabilities.
{The keyboard shortcut command+F5 is what toggles it on/off.}
In OS 9.2.2 & before, it was easier to mess around on purpose
and make almost anything speak; and have the OS read it aloud.
If certain keyboard combos were accidentally pressed, it's possible
to have turned on Universal Access> Voice over commands. If you
were unable to make the talking go away from that System Prefs
panel, post back and specify what was tried.
Here's an example of one or more instances of accidental VoiceOver
by keyboard combo happenstance, and one of them involved another
key change. Not knowing what else may be going on, you can check
into the topic by simple online search...
• How to turn voice off for menus?
http://forums.macrumors.com/showthread.php?t=450898
Perhaps another can refresh the collective consciousness in the
matter of where else to look to disengage and engage the audio
interface which makes keys speak as you keyboard in OS X.
Hopefully this helped somewhat.
Good luck & happy computing! 🙂