Elastic Drums & Ableton Link sync engine preview with 3 devices (video)
"3 Devices with Elastic Drums and an early implementation of Link playing together in sync perfectly :)
This version of Elastic Drums is NOT YET IN THE STORE, but soon, with the next update
Link is a technology that keeps devices in time over a wireless network, so you can forget the hassle of setting up and focus on playing music. Link will soon be available to Live users as a free update, and to the wider music-making community as a built-in feature of a growing number of iOS apps."