1. You can start editing a chord by tapping its name.
2. When a chord changed just tap on the next chord (Tablet mode) or tap Save button (Phone mode).
3. Check out the video which demonstrates how to play a chord as arpeggiated one:
Piano Companion is flexible chord and scale dictionary with user libraries, reverse mode and a progression builder.
ChordIQ
ChordIQ
is a music-based mobile game focused on learning notes, guitar and piano chords in a fun and interactive way.
Songtive
Songtive is a songwriting tool, band and social network. Songtive helps to experiment with arrangements and chord progressions which is available for iOS/Android.