I have been using Audio Evolution for my Multi-Track Recording for both Audio and Midi with SoundFont(sf2) support and onScreen keyboard in My Sony Xperia Z Tablet and Latency is not a problem. It can be managed on Android by tweaking your settings properly. The Android 5.1 update solved this latency problem by 95%. So the issue here depends on what device you are using. Sony is my best choice for Android when its about music production.