Love chord pad, however can you expand it somewhat…
(1) Give the ability to make your Own Chord Shapes, and assign a name for each one. Give the ability to click on something around each chord pad to pull up a virtual keyboard. On the keyboard you have to ability to select keys and put them in a pressed down position (toggle click turn on/turn off), thus building your own chord shape. At the end, all the keys pressed down will be the chord played when that pad is hit. Allow this to be done on EACH pad separately. You now have custom chord shape ability using the pads. In that virtual key board popup window have the ability to assign a name shown on the pad if wanted… Have Step transpose buttons + - so you could copy a custom chord shape to another pad then move it up or down depending what chord you want it to be. Don’t limit the number of keys that can be put in a pressed down position so really complex chords could be created.