macOS 13 Ventura or later. Apple silicon and Intel. About 20 MB, lives in the menu bar.
It's signed with our Apple Developer ID and notarised by Apple, so macOS opens it without blocking it.
Three switches in System Settings. Speaky Box opens the right page for each and ticks itself once they're on.
fn, right option, anything. Hold it, talk, let go. Text lands where your cursor is.