Haunted house telescope?

[brickey.8]

I'm stuck on the part in the haunted house where you can enter the telescope. Inside the telescope, I've found two switches on the ceiling which make glass walls come down. Since nothing happens in the outside world, I assume that I'm supposed to do something else in there too. But I can't find another switch no matter how hard I look. Am I supposed to do something elsewhere first to, say, direct light into the telescope?

As far as I can tell I've solved all other puzzles except the light puzzles and the room with the mud. There's no lasers to use FOR the light puzzles except one above the telescope.

[Kelrycor]

The switches are one part of the puzzle. And your idea with the "direct light into the telescope" is not so wrong.

Remember Pepelogoo?

...and its special attack?

[brickey.8]

Honestly no I don't remember what attacks that character used and/or gave me, I played the early parts of the game a while ago, I'm afraid I need a more specific hint than that.

[Kelrycor]

No problem. Pepelogoo can eat ghosts. When fed up it can fire a light beam to defeat enemies... or light up the telescope ;)

[brickey.8]

Isn't that the name of a character though? Is he somewhere in the house? None of my items are named that.

[Kelrycor]

It is the blue flying thing who searches for the green haired girl you met earlier in the game. He will be in the house later on - you can't miss him because he is part of the story there.

If you concluded the haunted mansion already you can re-summon him by going to the mirror in the lower left area from the hallway (in the cellar, to the left).

[brickey.8]

Ok actually the problem was that I didn't see the marker on my map and hadn't found the room where you're supposed to use the chapel key. Turns out this level is a lot longer than I thought!

Now I'm stuck at the part right after getting the dragon talisman. I went to the big tall room with the four book pedestals and read them all while in the spectral world, which supposedly taught me pieces of a music sheet, but I have no idea what I'm supposed to do with them next. The map marker is directly under what looks like a vertical shaft gated by those blocks you can only destroy by possessing a spiky ball, and I assume I'm supposed to get above it somehow, but I can't see how.