SyncKontrol is a free iOS app for iPhone which allows you to control the tempo and start/pause functionality of any Korg product with audio sync in. The app also offers Tap Tempo, a Swing function, and WIST (Wireless Sync-Start Technology) to sync to WIST-enabled apps such as Korg's iMS20, iElectribe and iElectribe Gorillaz(tm) Edition. In addition, this application receives sync from Mac based DAW software by receiving MIDI clock and play/stop commands via Wireless Network MIDI.

for iOS: