JFTR some users might find setting up jackd to complicated, but jackd provides advantages, e.g. "Within software, jackd provides sample-accurate synchronization between all JACK applications." - http://manual.ardour.org/synchronization/on-clock-and-time/ This does mean, that signals are not out-of-phase, so there won't be unwanted filtering effects. The easiness of other sound servers comes at a price.