I was trying to remember some strange story I saw as a kid. It was on TV, but it don't remember if it was a TV show or a movie. I remember that the camera work was in color, and had that weird gamma-correction look of early video.
The plot involved 3 or 4 people in a supposedly haunted house that had a pipe organ installed in the parlor.
They discovered that by playing a specific melody on the organ that it would trigger hidden memories in one of the women.
She went into a trance walked around and started clawing at a blank section of wall. Two men took crowbars or axes and opened the wall to find a hidden door behind it.
I don't remember what was behind the door, but I remember it was scary, and somehow solved the ghost story of the house.
Is that enough to go on?