Reference - Operating SpeakOn:
The user operates SpeakOn with a keyboard. SpeakOn responds with speech to convey information. You can mute the speech temporarily by pressing the [Ctrl] (0) key.
If you try to perform an operation which is not allowed, SpeakOn will respond with a short sound referred to as a 'Beep'. For example, this will happen if you try to navigate beyond the last item in a list or try to use a key which is not allowed for a particular control. An example of this is an 'Action' control which accepts only the 'Select' key and if you try to use the 'Up' key within this control, SpeakOn responds with a beep.
In many situations you will request media from the internet. Sometimes, due to a slow connection or the load on a server, your request will be delayed excessively. In this situation, if you try to press a key, SpeakOn will respond by saying: 'Please wait a bit longer'. If you don't want to wait, you can press the 'Cancel' [Esc] (0) key to cancel the connection. This may happen immediately or may take up to approximately 20 seconds.