If you change the license to GPL, you must provide the code of the software. Where is it? If you are keeping it on SF, it is not publicly accessible.
You find the code in the download section. Here the direct link: https://sourceforge.net/projects/playbox/files/playboxfx-8.0.0-sources.zip/download
Anonymous
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You find the code in the download section.
Here the direct link:
https://sourceforge.net/projects/playbox/files/playboxfx-8.0.0-sources.zip/download