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What an open-source license means if you only make music

Answer in brief

For a producer who plays the synth and releases music, an open-source license like the GPL is mostly about the program and not the song. Its terms start to matter when you pass on a changed copy of the synth or sell sounds built from its factory content.

The license is about the program

Surge XT, Dexed and Odin 2 use the GNU GPL. It sets the conditions for copying, changing and passing on the synth itself. The Free Software Foundation’s FAQ says the output of a program is “not, in general, covered by the copyright on the code”. In plain words, playing an open-source synth on a song does not put the song under the GPL.

When the conditions do apply

  • You change the synth’s code and give or sell the changed version to other people: the GPL then asks you to make its source code available to them.
  • You change it and keep it for yourself: the same FAQ says you may use a modified version privately without ever releasing it.
  • You want a friend to have the synth: linking them to the maker’s page is simpler and gets them the latest version.

Presets, samples and wavetables

The FAQ makes an exception for art or audio that comes from the program itself and ends up copied in the output. In a synth that means factory presets, samples and wavetables, which can carry terms of their own. This mostly matters if you plan to sell a preset bank or a sample pack, so read the terms for that content first.

Freeware and free tiers have licenses too

A freeware synth or a free tier comes with the maker’s own license agreement instead of the GPL. Vital’s agreement allows its software in commercial and non-commercial music and even in commercial sample packs. It does not let you share presets, wavetables or other media made from its unaltered content. Other makers set different terms, so open the license for the synth you actually use.

Questions and answers

Can I sell music I made with an open-source synth?

In GNU’s reading of the GPL, the license covers the synth’s code, so playing it on a track you sell does not bring the track under the GPL. Factory content can have separate terms, which matter most when you sell sounds rather than songs.

Sources for this page

  • Studio 56: Studio 56’s official website, the publisher of this reference.
  • Vital: Vital’s official page, the source of its description here.
  • Surge XT: Surge XT’s official page, the source of its description here.
  • Dexed: Dexed’s official page, the source of its description here.
  • Odin 2: Odin 2’s official page, the source of its description here.
  • GNU GPL frequently asked questions: the Free Software Foundation’s answers on program output, private changes and passing software on.
  • Vital end user license agreement: Vital Audio’s terms for its free and paid packs.
  • Odin 2 source code: the repository whose license file names the GNU GPL version 3.

The practical advice here is our own. A maker's description of its product is not a test of how it performs.

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Cite this page

Best Free Synth VST. “What an open-source license means if you only make music.” Studio 56 Reference. Content reviewed November 8, 2026.

https://bestfreesynthvst.com/open-source-licenses/