The NextGen application can be seen as a virtual sound decoder that supports ESU sound files in combination with a z21. To give a impression of its possibilities some videos. With version 2 it’s getting more and more a representation of the original loksound decoder.

https://youtube.com/watch?v=AT-I09XtFTo&feature=share

https://youtube.com/watch?v=XfKAE8kLtVc&feature=share

https://youtube.com/watch?v=I4sDIKmeXy0&feature=share