Both applications are capable of syncing to jack. Set both to do that, and they will sync together. In ardour: windows->options->sync->Positional sync = Sync with JACK In hydrogen: in the main window, there is a "jack transport" setting which should have a green "light" in it. Sampo Quoting ish@xxxxxxxxx: > Can one sync Hydrogen with Ardour so they can play together( ie Play and > stop together) i.e. we use the mixer of Ardour(with one track of > Hydrogen) > for the final mixdown with the Ardour Mixer. > > <>ISh > >