Use the checkboxes to choose the chord types and inversions that you would like to practice. The button will then choose a random chord and inversion from any of the 12 keys.
Use this to practice your chord inversions for the main chord types.
Use the checkboxes to choose the major and minor seventh types that you would like to practice. You can then use the buttons to choose a random seventh chord from any of the 12 keys and display the appropriate 'shortcut' chord to be played in the right hand alongside the root in the left.
The button will choose a random key from the circle of fifths. Use it to practice II-V-I progressions.