For Sibelius Access to work properly you must be using an English keyboard layout and input language. Do not confuse this with the language options that JAWS provides, the options in question are a part of Windows itself. It doesn’t matter which language version of Windows you are running, because all versions of Windows allow you to change the necessary options.
You will first need to install the English input language and keyboard layout, which is done through the regional and language options dialog that is found in the control panel. Please do the following:
You have now installed an English input language and keyboard layout.
You can switch between this layout and the other layouts which you have installed by pressing Alt+Shift. JAWS will announce the new input language whenever you use this keystroke. You must remember to switch back to your default input language before leaving Sibelius.
Warning: You should take care not to press Alt+Shift whilst in certain programs. This is especially true in Microsoft word, since it will insert a language change within the open document. This could affect various word settings, such as the spell checker, and also how JAWS speaks.