I'm not familiar with the AUM app and do not know how much of this track was made from presets, but it do sound REALLY satisfying. That is totally the type of music I'd play in the background as I study.
Happy to go into it if you're interested in AUM. It's a trackless DAW, great for live-play on iPad/iOS. I started with "presets" on the main voices (I wish I had the time to sound design in further depth), but tweaked them and added piles of effects to them of course too. I'd say they're barely recognizable. Glad you liked it!