Here’s a quick guide on how to turn that hourly beep off with Casio W96-H.

Guide:

1. In normal time mode press button 1 once to get into alarm mode (“AL” in the upper left).
2. Press button 2 once to get into the hourly time signal screen (“:00” displayed).
3. Press button 3 to toggle the hourly signal on and off.

Anyway, here’s a link to the manual.