- Below 20 custom sample sets, they are shown as ternary buttons.
- Above 20 custom sample sets, they are shown in a dropdown (yes there
are actual cases of this as I've been informed by the NAT; one example
being https://osu.ppy.sh/beatmapsets/1018061#osu/2197383)
As a bonus, to make determining what the heck is actually changing when
adjusting these controls, the full set of applicable sounds now plays on
adding/removing additions, changing their banks, as well as changing the
custom set (if any).
For now there are no user-facing controls to add the samples to the map
yourself, you have to know how to name the `.wav`s and edit-externally
them in yourself. *For now.*