Looks like my question about samples is settled, but what about software synthesizers? They might be licensed under GPL, but the software license is not transferable to audio output from the software. I should have the right record the output from synthesizers and waive it under CC0. So if I make mu...

Can I use GPL-2 for project file?

Hello!
If I create a music in LMMS with built-in samples and synthesizers, can I waive my music under CC0 (public domain) for both render file and project file?