The only issue I had in moderation was if I enabled the transition, it would not insert due to a branch out of bounds. I fixed that upon approval, so no more worries there. Also made it easier to change the sound effect channel and cleaned up the SA-1 compatibility.
NOTE: Doesn't work with vanilla light switch and dark room.
Fixed the bug where pausing the game will keep the effect going (bugging the music in the process), also did a better gif. No major changes in the code were done. Ironic how the requester of this code fixed its bug, right?