MIDI File and Style File manipulations

[sugarplumsss]

My questions ( which I said I would post, in an earlier thread ) are based on relatively easy manipulations of Style files and MIDI files.  If a manipulation ( eg extracting a drum part out of a Style or a MIDI, is too time consuming ... I may back off of it ) is not difficult to accomplish on the T4... I want to know that, and vice versa, if they are very time consuming, I want to know that too.

I have not yet purchased any apps from the key designers posted here.. eg Murray and Michael

So the suggestions will have that overlay on them as well... eg  WITH this or that app, and the extraction of a part, WITHIN T4.

For now, drums parts are easiest thing to focus on.
1. Extract  a Drum part from a MIDI SONG ( all my MIDI songs are Yamaha ). I am assuming this is feasible?
I am guessing that drum part would be turned into a Style file and then into a Registration?

2. How to use the 4 "sp"s  ... the markers on a MIDI Song?  Some songs have the songs Marked already, but many do not.
3. Can I change where the markers are in a MIDI that is already marked?
4 Some MIDI's have chord displays on main page... but then at some point the chords disappear. Can that be corrected so I can see chords throughout?
5 Some MIDI Songs have no chords what so ever.. Is there a way to retrieve them?

That's a lot of questions... thanks