This app is a musical instrument. You play this instrument by Holding a "Chord" button down and "strumming" with a finger to produce notes in that chord. (This REQUIRES a multi-touch screen like a cellphone or tablet.) The instrument produces major, minor, dominant seventh, major seventh, minor seventh, diminished, 6th, 9th, sus4, and augmented chords. The strumplate produces 16 notes in the selected chord. Playing the instrument can be done using a maximum of three fingers on the left hand, and one on the right. This instrument also produces MIDI output if you have appropriate hardware.. This is a DEMO version. It is fully functional, but you will be interrupted periodically with information on purchasing the PRO version (https://play.google.com/store/apps/details?id=com.estrummer.estrummerpro).