Ok I'm confused. . .
You say "Memory Act". . . are you talking about a demonstration of your ability to recall things or an act focused on other people's memories? (I'm assuming the latter, given the effects listed . . . and BTW, the 3 envelop routine is known as 4th Dimensional Telepathy; I'd strongly encourage you to study Bob Cassidy's notes on that routine as well as his video "webinare" download -- find out more via Jheff @
http://marketplaceofthemind.net/forum/index.php.)
If you are invoking other people's memories I'd suggest looking into Sensory Projection from Underground Collective. There's no need to create your own trees, just use the movie themed example they have in the book; this is one of the most mind-boggling bits in my shows.
Confabulation can be effective with this sort of program but it's something you will want to do some studying on in that there are several methods by which to make it happen (Paul Stockman's being one of the most deceptive I've seen in years and it can be done without any additional help).
When it comes to actual "Super Memory" type routines that are easy to do, check out Lee Earle's "Deep Sea Digits" (Syzygy magazine compilation).