HOW TO INSTALL THE APP:
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Download the app and Double-tap it to install it.

IF IT REFUSES TO INSTALL...
By default your phone can only install from the PlayStore. Change this...

1. Open SETTINGS and then tap SECURITY.
2. Tap option: UNKNOWN SOURCES to ‘check’ it.
3. Run the app. If no voice is heard when clicking the ASL or ATO buttons you should check your phone's Text-to-Speech settings...
APP INSTALLING AND TEXT-TO-SPEECH
INSTALLING THE 'TEXT-TO-SPEECH' FEATURE ON YOUR PHONE.
Your phone should already be using the Google TTS engine. If not...

Go into your phone SETTINGS and find Text-to-Speech Options. (Try under Language and Input). If you see a TTS engine installed select it otherwise go to the PlayStore and install the 'Google TTS' engine.

Once this is installed you should have text-to-speech.
back...
Installing CoPilotInstalling CoPilot
Android's Text-to-Speech options page in System Settings, shows Google TTS installed.