1) If you have to record back knx000 styles (generally 5 parts = drums, bass, accomp1, 2, 3) you must synchronize Cakewalk with the Keyboard.
KN Styles are generally 4 measures long, so I want my KN to start recording exactly when my PC starts playing back measure 1 !
CAKEWALK is Master, KN use the midi clocks it provides (Internal Clock OFF)
2) In the other way, it does not matter.