A new version of Jacker is out: http://bitbucket.org/paniq/jacker Changes: * Command-Line support. If a song name is passed to Jacker at startup, it will load it. * "install" command. You can now install Jacker globally. * New logo. Less glossy, more elegant. * Fixed a terrible timing error that introduced a jitter as big as the current latency. * Default number of tracks raised from 8 to 16. * Tracks can be renamed. Double-click track to pick a new name. * Mute buttons for each track. Not that reliable at the moment. Last played sound may hang. In this case, stop, then continue playing. * MIDI input to connect your keyboard, to test sounds before you track them. Click on a track label to route your keyboard to the particular output. * Initial JACK transport support. It's useful for synchronizing a recording to a DAW like Ardour. Can be switched on with the "Sync" button in the toolbar. Not too stable on start-up and loop borders. When in trouble, stop, seek, then start.