I got you covered ! 
When you click on the piano view to display all possible calculated chord fingerings (wayyy more than 138 actually), if you long press on the magic wand you got access to filters so that you can filter out many of them : on the top row you can choose rootless/3rd-less/5th-less positions, and you can choose either just block chords or just open ones or any.
On the bottom row there are options for 4 filters : the first 3 ones are arbitrarily based on the number of fingers you need to play the chord and calculated for any chord, the last one (“common”) are presets I hardcoded for common voicings of most chord types (so it won’t work for advanced chords if I didn’t hardcode them but still a lot of them will be covered as common presets), clicking on the magic wand picks randomly a chord voicing, the arrows on the left select the next/previous calculated fingering, the -/+ buttons on the right are here to scroll the piano view in higher or lower registers.
This part is already working, the mini keyboard view is draggable as the app works as well on iPad
Oh and when you press on the root/bass pad (the one that’s always with a white border) it plays back the chord, and when you long press it plays back the arpeggio.
