Yes, it´s freeware
Btw, I wrote my first sequenze:
VOLUME 0
BASE 150.0
SET 30.0
FADE 30.0 5
SLIDE 20.0 20
HOLD 5
SLIDE 12.0 40
HOLD 5
SLIDE 7.0 60
HOLD 3600
SLIDE 0.5 180
HOLD 300
FADE 0.0 5
EXIT
It brings you from 30hz (beta: wakefullness) to 7hz (which should be the stage where HI occures), stays there for one hour, then brings you to deep sleep and ends itself.