If you're not hearing the audio for chases or item pickups, and these options are selected 'on' in the app's settings menu, there may be a problem with your Text-to-Speech engine on your device. You will need to have Text-to-Speech enabled in order to hear chases and item pickups. This can be resolved easily however there a different steps depending on which platform you're using.
Go to Settings > Language & Keyboard >Text-to-Speech output. You should then see a list of available TTS engines. If none of these is selected we recommend choosing Google's TTS engine as this works best with Zombies, Run!
Go to your phone's settings menu, then go to General > Accessibility > VoiceOver > Speech and then select a Default Dialect. You'll need to make sure that you choose one of the available English Language Dialects in order for item pickup and chase notifications to play correctly.