Hi Hans!
Thanks for subrscribing on Youtube.
You have never heard about the soundmodule? You will like it. It can also be used as a standalone solution. That is what I did before Arduino. You only need Voltage, two buttons and a speaker.
Never heard about different versions. Maybe you have seen the older and bad working WTV020. Don´t buy this one!
The module number of the DFPlayer mini is MP3-TF-16P. Then you will have the correct one.
I can send you a working LED-effect with sound code if you want. It is again a Star Trek related code for lighting a Klingon Bird of Prey.