The sfx_gen C library and the CLI program may be used under the terms of the
MIT license (see sfx_gen.c).

The GUI program in the gui_qt directory is licensed under the GPLv3 (see
https://www.gnu.org/licenses/gpl-3.0.txt).

The SVG icons are from https://icon-sets.iconify.design/?query=wave and
licensed as follows:
    wave-noise.svg: Copyright Austin Andrews, Apache 2.0 license.
    wave-[st]*.svg: Copyright Phosphor Icons, MIT license.
