I would say this is primarily (to me) for use when wanting to repeatedly practice chords or solo lines on my instrument(s) along with the presented progressions (which are excellent, IMO).
Secondarily, it would still be valuable in the ear training game context because solving the puzzle correctly (meaning not dragging an incorrect chord into place) does not by itself mean that you “really have it in your ear”.
Some of the time, and the moreso the more complex the puzzles get, it’s like “ah, so -that- progression sounds like -that-, let me listen to that on repeat a bit to help it sink in!”.
I agree this would be super useful.
Would think this to be an easy quick-win request, that hopefully is as easy as changing some navigation (in this case, don’t auto advance)? It would make sense to have this in settings or customize section.
Along the same lines, would LOVE if you could leave the chord icon/buttons on failures. This wouldn’t even need to be an option/custom thing, as it would not adversely effect the navigation/experience. I want to be able to “press” the buttons to hear the reference chords, but they disappear on puzzle failure. Just don’t hide them, perhaps?