What's here works really well for the most part. It's not perfect and has a few bugs. The most worrying thing, though, is that the developer seems to have stopped updating it. As it is, this is a functional but incomplete product.
FSRealistic was a game changer for me. I first thought that almost 30 Euros for an app that changes some sounds in Flight Simulator is a bit expensive, but in my opinion, it's absolutely worth it. FSRealistic offers a wealth of sound and other features that make flying small airplanes and large jets incredibly more realistic. You can activate the sounds that you like and choose from a variety of sound files for each sound effect. In addition, the shaking effect (e.g. during ground roll or landing) adds a whole new layer of realism. Much appreciated! The app is easy to use and has been well programmed. It connects automatically to the simulator once you've started the FSRealistic app and loaded a flight. My personal favourite is the reverse sound module which lets you add reverser sound to all applicable aircraft. When I first landed a 747 using this new soundkit, it was the first time ever in the Sim that I really got the feeling I was actually sitting in a 747 right now.
This program adds just a lot of things that are lacking in many aircrafts, and if the aircraft has already customized sounds for some events, you can disable the according sound in the addon. Everything is very customizable with a good range of different sounds and effect. Very stable and no performance drop. Must have.
Leider gibt es ein Problem mit dem Zoom. Der Zoom im Cockpit friert leider ein oder mehrmals ein pro Flug. Man muss also das Programm schließen und neustarten. Das frustiert. Trotz einigen Updates wurde das Problem nicht behoben. Seit einiger Zeit kommen auch keine Updates mehr. Zu diesem Zeitpunkt kann ich das Programm nur sehr eingeschränkt empfehlen.