I understand what you want, but this is a totally new function, and really nothing to do with apc to smf convert which converts only auto accompaniment tracks. I can't understand why you think R1 is converted because it is ignored in the process. Whatever is in R1 before apc conversion is the same after apc conversion unless you overwrite it with an accompaniment track.

Your wish is to change a technics easy recording using panel memories into a technics multitrack recording requiring all control changes in each track. This is really a lot more complicated than just carrying over voice and volume changes from panel memory and a little like wanting to change apples into pears, if I may use an analogy, which is why the sequencer has completely different setup templates for these two different methods of recording. It may be one day with a fast processor and large software module, but complicated.

By the way I could add to your first query, NX is just a sound set like XG or GS, and there are many other factors determining whether files from different machines are compatible. Making an NX midi on the 7000 to play on a 6000 would be the same as making a standard midi file to play on the 6000 except that the sounds are better but some samples will be missing so you will get random strange results, which would obviously not be the case with a general midi.