Try the following.
The DF7X has a weird sound folder.
I’ve never seen it in any other aircraft.
What I ended up doing was as follows:
cut the following folder out and move it somewhere as a back up folder.
sound.falc.\
Now within the df7x folder make the following folder sound and install your
sound package that you purchased into the sound folder that needs to be within
the df7x folder.
That is what worked for me.
hope it will work for you.
Ron