Forget rendering in the background. In the old version, hitting "Export to WAV" froze the app for 45 seconds. The screen would dim, a spinning wheel would appear, and you just hoped the Android OS didn't kill the process to free up RAM (it often did). This fear taught a generation of mobile producers to save every two minutes.
Musicians are finding their old Samsung Galaxy Tab 3 or HTC One M8 in drawers. These devices have 1GB of RAM. The modern version of Audio Evolution (v3.x and above) crashes on these devices because it expects 4GB and a modern GPU. The old version (v2.0.5) runs like a dream on Gingerbread and Ice Cream Sandwich. audio evolution mobile studio old version