ExSynth is a virtual analog synthesizer that is equipped with not only a synthesizer but also a loop sequencer and effectors. And it supports USB-MIDI, you can play the app with MIDI Keyboards or controllers if connected to the USB port. Synthesis: It adopted ordinary subtractive synthesis, that is based on "Common Analog Synthesizer".
Download the setup package of ExSynth 1.09 free of charge and take a look at users' reviews on Droid Informer. The app works flawlessly on Android 3.2 and higher. This application is totally safe to download. Oxxxide is the developer of the tool which refers to the Music & Audio category.
Over 5K users downloaded and set up ExSynth and the most recent update was on Apr 9, 2016. People rated the app 4.3 on Google Play.