I have recently splashed out and bought the very expensive Yamaha lead to connect my keyboard to my computer. Everything appears to be working correctly but I am confused by the apparently different behaviour of .mid and .not files.

I have set my keyboard as the default MIDI playback device using Quick MIDI Device Setup. If I now open a .mid file it plays back automatically through my keyboard. Furthermore, when I look in Track Setup it shows my keyboard in the Device column for every track. However, when I open a .not file it still plays through my computer speakers. The only way I can make it play through my keyboard is to manually change the device for each track in Track Setup. I have learnt how to change all tracks in one operation by clicking on the Device heading button, but I don't really understand why it doesn't make the change automatically like it does with a .mid file.

Two questions then: Have I understood the behaviour correctly and, if so, what is the rationale behind it?