+ JACK provides clock synchronization and is not concerned with time code
+ (this is not entirely true, more on jack-transport later).
+ On the software side, jackd provides sample-accurate synchronization
+ between all JACK applications.
+ On the hardware side, JACK uses the clock of the audio-interface.
+ Synchronization of multiple interfaces requires hardware support to sync
+ the clocks.
+ If two interfaces run at different clocks the only way to align the
+ signals is via re-sampling (SRC - Sample Rate Conversion), which is
+ expensive in terms of CPU usage and may decreases fidelity if done
+ incorrectly.