Excellent questions.
1. Several ways. You can set Jamstix to play the midi file from a channel you assign to it. On the top left you will see 'Midi Playback' use that to play any midi file you have. You can also import the midi file, and this is when it gets really interesting and fun. Go to Groove and click that. Then select Special Styles/Import and read the description. This is how you can use a midi file that you create (or pre-made like Groove Monkee) to create a style that you want.
2. If you write the part in Jamstix, you can save it as a new style!! And get any number of different drummers to try it and see what they come up with. Yes, it's that powerful. Or like I said previously that you can import a midi trk and save it as a new style. I don't think I have used more than 8 bars for a new style. And as little as one bar. Just depends on what your going for. Beauty of the program is you can have more than one style or drummer in a song. Yep, it's that powerful!!
3. Here is the fantastic part: Once you got the style you want, you go to the song section tell Jamstix to put an intro in, then a verse, then a pre chorus, then a chorus and let it come up with the parts on it's own! Just like you explain to a real drummer how you want a song played, then you turn him loose. Then you can select to add some swing to certain parts of the song, or the whole song. Select different power levels for each part of the song (and this affects how the drummer plays the part).This thing gets really deep. I'll just leave it there.
Will there be some fine tuning? Of course. But what you can come up with is only limited by your own input. You will have to spend time with it and the manual. I am still going back in the manual and learning. For certain songs I found that Jamstix did a better job than any of the programs I have. It was all about the feel. It's got feel. Good feel. You just have to learn how to use it. No way around that. Your time will be well rewarded.
And it's sounds are very usable. They benefit from external processing for certain. But they do have a very natural sound to them.
I believe he doesn't ask enough money for what this program can do. At this price it is a no-brainer.
Mark, thanks for the link to the videos. I will give them a watch. I also use AD to go along with or instead of the Jamstix sounds. I find it works best with AD, and not EZD.