The Live Audio Archive is the shifting pool of real-time audio available online. Each year on International Dawn Chorus Day, SoundCamp draws on these materials for Reveil: a 24-hour broadcast of live sounds of daybreak that loops the earth with the Grey Line of twilight. Reveil brings remote ecological and acoustic projects together in a tour of this emerging field. Technical resources developed for the project are applicable to both ecoacoustics and musical composition. Affordable and simple, they have potential to create an extended and diversified open microphone network as a resource for researchers, artists and activists.