When you edit the article Synthesizer in 9 April 2015 (UTC), you wrote "English, slight clean up" on summary field (see history). However, your change on that revision is not what is summarized as "English, slightly edit", but the your imaginary writing without any reliable sources. Thus, your revision have been reverted as good faith edit. Please stop lying on summary field, and also stop re-writing article based on your imaginations without any reliable sources.