GridSound 
GridSound is a work-in-progress open-source digital audio workstation developed with HTML5 and more precisely with the new Web Audio API. The application can be used at gridsound.com/daw it's also possible to create an account on gridsound.com to save your compositions online to retrieve them from anywhere at any time.
Some links : Help • Changelog • Previous versions
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screenshot of the 0.34.0 version
