Unfa's Expermiental Wakeup Alarms Simple Khz Tone Min Crescendo

I wanted to make a very gentle wakeup alarm for my android phone. It's a 25-minute long fade in of a pure 3-khz tone. Created with audacity. I encoded this to ogg vorbis for personal use, but i'm sure you can do this better for yourself (maybe you'll prefer other format), so here you have a quality flac file for source.