I was revising this one, and I stumbled uppon some information about vocals and such:
http://anison.info/data/source/40.html
https://www.wikiwand.com/ja/%E3%82%B...94%B1%E6%9B%B2
Maybe I am missing something, but it list Melodie Sexton as the one that provided the vocals for the first track among others.
I am pretty sure about most of them save for Information High... but it seems a lot of places credit Sexton for the vocals... anyone knows a bit better?