When I first made the lozenges they were not connected for transitioning notes. I was happy with this and so created a class that would generate geometry to curve without changing thickness.
I did want some colourful notes to come off the heads as you sing, changing colour depending on how close you were to being in tune, but I can’t remember what happened to them, I think they were swapped for the pop up text to make it more obvious how you were performing.
One annoying thing about representing music, is how to show shifting down or up an octave to every type of user. In the end, they are just meant to sing, the lozenges are just there to represent how well you did, and what note you are singing in relation.