Hi, If you want to work on Linux the 'modular way', you need good Jack Transport, for syncing apps and looping. Currently there are some limitations, which you can find here: http://trac.jackaudio.org/wiki/TransportLimitations So looping is not really possible. Maybe you as an Linux Audio User can describe a concrete 'user case example'. Something you like to be able to do with some apps, but which is not possible at the moment. Think about syncing but also looping with Jack Transport. This will help us getting a clear picture about the state of Jack Transport and how it could/should be improved. Thanks in advance, \r