The audio boxes are a native datalist, which lists only files whose names contain
the box's text, so a filled box showed one or two clips. Pressing a box now empties
it to list all of them (the file shows as the placeholder) and puts the file back
when nothing is picked; Backspace or Delete really clears it.
Picking another clip kept the old clip's line next to it. The line box now follows:
the line it had for the first clip, the line the node already reads for a clip in
use, or blank, which makes the node read the clip's own .txt / .lab / list line.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>