Converting a SMF into NX will allow the keyboard to replace any GM instruments with Technics sampled instruments that it recognizes. This allows you to use the much better sounding Technics instruments instead of the poorer sounding GM instruments. For example, a GM trumpet will be replaced with a Technics trumpet, etc. You will also have full Technics keyboard control over the instrument sound. Whenever I load a midi backing track into my KN6500, I always load using the GM --> NX conversion. Much better sounding. Hope this helps.

Peter