GSX works perfectly with the Aerosoft Airbus A320.
In fact, it works even better than with other airplanes, since Aerosoft has programmed it with full support for GSX so, you are mistakenly thinking "it doesn't works", because you don't know it works differently with the Aerosoft Airbus, it works more automated, but require knowing how to use it.
Here's a video made by the Aerosoft Airbus author, showing how in integrates with GSX:
