The goal of midiArranger is to add an Arranger functionality to a Synthesizer and offer an intuitive Piano Roll editing interface for quick and easy Style creation. It can be used as a Sequencer.
It does not produce sound by itself it communicates through MIDI over USB with an external Synthesizer.

Very Important! Your device (phone or tablet) must support USB Host mode and a USB OTG cable is required.
If midiArranger don't detect your Synthesizer when you plug it in then your device might not support USB Host mode or cables are faulty.
An easy way to check USB Host is to connect a computer mouse to your USB OTG cable and see if it works.

Create an account on https://android-midi-arranger.com so you can backup and sync your styles between multiple devices. Styles can be imported from Public Library or from Yamaha STY format. The website provides documentation of how to use midiArranger and how to create Styles.

Please consult the list of known issues at: https://android-midi-arranger.com/known-issues
And frequently asked questions: https://android-midi-arranger.com/faq

Join midiArranger community on Googe+ to find out more and get in touch with other users.