Synth Anatomy got an early access copy of Shoom! The app should be releasing this weekend, and I'll post a link when it does, but in the meantime here is some quality droning.
This is a demo of the new Synthesizer App Shoom, coming this weekend to the AppStore. You can stack up to 3 Synthesizers in one patch and created very impressive drones. In this video, I make only drones with Shoom but you can do also more traditional stuff and playing with a lead sound.