That’s something I can’t do

While editing a promotional video piece that the client “directed”…

Client: Let’s just make that dissolve a second longer, but keep the timing to the voice over.

Me: I can’t, that’s the end of the clip.

Client: Okay, but a second longer.

Me: The clip ends right there. I can’t extend the fade unless I move the voice over…to keep everything in sync.

Client: Don’t move the voice over, just make the dissolve a second longer.

Me: It’s just not possible without - 

Client: God, this is so simple. Let me show you.

The client moves to keyboard and stares.

Client: Now, how do I make the dissolve longer?