An iPhone app by reunited digital hardcore group Atari Teenage Riot has been held up by Apple over concerns that it could spark actual riots, according to a report from Pitchfork. Seems those crazy Germans with their anarchy-inciting ways included a special audio player called “Riot Sounds Produce Riots,” which generates “very low sub basses, square waves, noise sounds which trigger hysteria and panic within the audience”—a panic not unlike the 1999 May Day protest where the group was famously arrested, and where those same sounds were first produced. In a press release, ATR encourages hooking your iPhone up to large speakers and experimenting with Riot Sounds in your neighborhood; meanwhile, Apple has put a hold on the app while it figures out whether that’s such a good idea.