Hey Peter
No problem :) Here are a few thoughts, but if you have time to make another post, please do so and I will add this answer to it there. That will make it easier for someone else to find this response from the Q&A list.
So back to your problem; What do you mean with "nothing has changed and all sounds/music are still there"? Still in the Wwise picker? or still selected in the Wwise-Type properties? or is it when you press play that the sounds from the original WAG is still playing?
If you are not seeing anything in the Wwise Picker, then...
* Did you save the Wwise project before heading into Unity? Because there's a lot of information that is fetched directly from the Wwise project and not the generated SoundBanks (so that if you haven't generated soundbanks you will still be able to see the content of the Wwise project in the Wwise picker).
Here's a bit more info on the Wwise picker:
https://www.audiokinetic.com/library/edge/?source=Unity&id=unity__picker.html
* Did you only download WAG or did you also download the Wwise-251 or Wwise-301 content? Cause when including the certifications, there's quite a lot of Wwise projects that are almost identical (except for the modifications related to the course steps). As such, if you have the original Wwise Project referenced in the Unity > Wwise Settings while working in the Wwise-301 Wwise Project, you will not see any changes in Unity.
So in other words, if you have added an Event to your Wwise project and the path in Unity is set to that exact same Wwise project, you should see all Events from the 'saved' Wwise project in the Wwise picker.
Let us know how it goes and if you make another post, please put a link to it here as well.