Today while reading a bit of Sleuthing C.S. Lewis: more Light in the shadowlands by Kathryn Ann Lindskoog I found the following excerpt:
Apparently the name of the project was changed to The Sunrise Path, all the song titles were changed and the cassette was still released. Altogether it was fourteen pieces, an hour long composed by Stanley and Angelee Anderson. Not sure of the year, but it seems to be mid to early 90's.
Here are two low quality wav files I've found:
Update: I was reluctant to tell you (because I don't want to spoil the magical quality I'm trying to project onto this situation) that I believe the synthesizer used on the Dawn Treader Suite was the spiritless