Hi, Here's the layout: Ardour beta 28 Latest Hydrogen Mdk 10.1 Latest Jack and Qjackctl. Was trying to Sync Ardour with Hydrogen thru Jack Transport. Everything would sync fine but could not get sound thru Ardour or even into Ardour it seemed from live inputs when transport was engaged and Ardour was set to "Sync with Jack". Did not have opportunity to try other apps with Ardour...never had this happen before though. Jack transport has always pretty much worked. The transport part works fine but seems odd to lose the inputs of whatever instruments are live because of it? thanks