Adding a volume control to a DVD player (potentiometer)

[Metallover]

I have an amp I found for free and an old dvd player. I want to use the dvd player as a cd player, but I still need to control the volume. I also found a Casette player for free, and I took the volume control off that. It's a potentiometer. It has 7 pins. Is there a way I can wire the potentiometer up to the DVD player to control the output volume?

It's the bottom left one on this picture