I think there is a a touch of confusion.
It is very possible to make a fast pass invisible. But to have a fast pass is not to have it invisible.
To have an invisble pass (preferable over a fast one, I think we can all agree) you need smoothness, balance, timing, fluidity and in my opinion, misdirection. Through good misdirection, a pass can become a mere gesture with the pack, or the setting it down on a table. These actions are not suspicious, not unnatural, and the pass then becomes nothing. Like every sleight shoould be.
But back to the topic at hand! I would also like to see Chris's views on the pass also, more-so on the sleight than on the mechanics (if you get my drift).
Ty