Cannot inherit from non-open class 'SAPlayer' outside of its defining module

[blu-barry]

SAPlayer is public but not open and therefore can't be subclassed outside of the module. Would it be possible to change SAPlayer to open as to allow for modification within outside projects?

My overall issue is that I need to play multiple tracks synchronously as can be done in AVAudioEngine, but with the functionality and flexibility of SwiftAudioPlayer. The only solution that I currently see is to inherit the SAPlayer and modify it for such a purpose. Is there another way to achieve this without setting SAPlayer as open?