Thanks everybody for the help.
One of you was wrong about the Korg though. It plays gm midi files fine. It's from 1994 I believe, and was also upgraded later on with new OS info.
So you were saying that it will play different tracks with the same channel without sounding screwy? It didn't work that way for me. I had a song that had two seperate tracks with two separate drum kits, and I changed them both to channel 10 on the Korg before trying it again on the SD1. It didn't work. Even worse, it seemingly screwed up my main drum track. It definitely didn't play the timpani from the percussion kit either. :-(
Another thing I don't understand is that when you are playing the midi file and you press start again (there being no stop button), it won't start playing again when you press start. What's also harder to follow is that on my Korg, it would always have on the computer screen the measure it was currently on. I could stop it, use the dial to go any number of measures back or forward, and play again. I don't see how you do it with this one.
Can you also edit the same way? For any song I'd move up a few screens and enter into the song data and it would show you each measure along with the notes and their velocity, length, etc.
Something like this:
1/1 C#4 127(vel) 34(sec)
1/2 f#6 124 18
etc
So I could easily locate each note in a measure and alter the main parameters.
Apparently I'm also going to have to change some drum notes.
First key on the keyboards (E1), is the best kick on my Korg. I think it's something different on the SD1.
Same with my drum kit 2 (power kit). F1 was the best snare. What a drag all the drums between keyboards were not standard.