Best Ai sound program?

Thanks to tips from users on here I have got FSX running pretty well. So now that I have some frames, I spent the past few weeks adding AI paints and new flightplans to the Ultimate Traffic database. But the Ai sounds are so bland and dull! What is the best Ai sound program available and does it have most sounds for props and jets? I see every ai airplane folder has its own soundai so aliasing to a new sound wont be very difficult.

Thanks!

David