Hi,
This is probably something where you’d need to start making your own alterations to the framework to get the exact audio session behavior you want, which shouldn’t be too difficult. You can check out what the audio session settings you need for that behavior are and then make your changes to the implementation of AudioSessionManager, and then re-compile the framework project to create a new framework for your app.
I think you probably are looking for a change of audio session category from the current playandrecord setting to the ambient setting — google or stack overflow should give more detail on this.
Please be aware that changing the audio session directly will usually prevent speech recognition from working (won’t be an issue for you if you are just using FliteController, but at some future point if you have unexpected results just keep in mind that you’ve altered the settings in AudioSessionManager).