by ShadowSabre » August 31st, 2013, 7:14 pm
I'd suggest Audacity-- it's a sound editor that's free, open source, and not that hard to use.
Chop off the induction and awakener, then if you want it to be subliminal add a second track of some other sound-- find a looping MP3 of rain falling, or white noise, or an ambient song you can listen to in a loop without it getting old. Layer the two so you can hear the track, but not make out the words.