Hm, doesn't sound like. The switch I'm talking about is down the furnace where you picked up the diode bulb. It opens a trapdoor in the room which leads back to the purple stream in the calendar puzzle room. That's where you go.
Me. This, flexagon and fight tunes. Codo did original version of Binary Star. Elio (Lara's Boyfr.) wrote the tunes from intro, attic, canyon and rotating lamp rooms. And there are some tracks of Peter Connelly's compilation which was a part of calendar extras.