Hi Francois
After much experimenting, I then found out that the “Standard Page Turn FX” cannot work in Vegas as within a normal effect it cannot access secondary layers unless you can add it as a Custom Compositing Mode, but it does not appear if you click on custom.
So the only way is to add it as a “Transition” and make your selection in there. So just drop the “Page Turn Transition” effect where each Media joins and then make the relevant adjustments.
You have to Change the “Animation” control from “Auto to Offset” else the Offset slider will be greyed out and then change the “Alternate back” to “incoming” which means that it will add the following image to the back of the previous one. If you select” Outgoing” you get the first Image on the reverse.
Hope some of this makes sense 🙂
I only did a quick experiment, so with more time no doubt it could be drastically improved.
Hope the Picture helps,
Regards