The Composer Assistant will only work if your main device/Windows region (and language) is set to UK, U.S or Canada (English). We do hope to bring the assistant to more territories and languages soon.
If you find that the Composer Assistant doesn't hear you, or pick up any sound from your microphone, you may have blocked the app from accessing the microphone.
Open the Windows settings app, and choose "Privacy". From there, make sure StaffPad has access to your account info, and access to your microphone. Rest assured that we only use your account info to pull out your first name, to display within the app, and the microphone only when the composer assistant is listening to your voice for commands.