An audio (possibly also video) chat app with a configurable fixed delay. Ninjam (https://www.cockos.com/ninjam/ https://www.cockos.com/ninjam/ ) implements the

An audio (possibly also video) chat app with a configurable fixed delay. Ninjam (https://www.cockos.com/ninjam/ https://www.cockos.com/ninjam/ ) implements the basic idea but the open-source client is fiddly to get working and the recommended paid client is a DAW so is also pretty daunting. It would be nice to have something in the browser. It would be nice to have something similar that worked as a website, and even could be sort of a cloud version of the A Capella app where you can collaborate on looping harmonies in realtime.