This document describes how to convert freeciv 2.6 compatible soundset to development version (one that will become freeciv 3.0) compatible ones. Currently this goes up to compatibility with freeciv S3_0 commit f0bb6c56d0 (alpha1) 16-Mar-18.
Capability string of soundspec file must be changed.
[soundspec] options = "+Freeciv-soundset-Devel-2018-02-27"
Event tag rename
Event tag e_unit_win is renamed to e_unit_win_def. Update reference to it in the soundspec.