You mean it plays some patch when you play the keyboard of the N364? Most keyboards have a “local on/off” switch. When set to off it will disconnect the keys from the sound engine and keys will only go to midi-out socket (and eventually back via midi-in).
Btw. in Combi mode midi channels /program change do work as expected on the 05R/W, I just had to leave combi-edit mode – it must stay in normal combi mode.