Yes, you should be able to do it directly to your arranger, or,as Fran suggests via any soft sequencer that supports marker insertions like Sonar, XG Works, etc. The DD55 is simply a midi controller ( it does have midi right ? ). It should work like any other midi controller. There are advantages to using sofware tools however, that you should be aware of. Unless you can time the notes perfectly or pretty close to it, you're style is likely to sound a little or even way off. Of course I'm certain that the Tyros will allow you to edit and quantize, but I've never found this to be very quick and effective in any keyboard sequencer..
If you were to use a softseq as a go between, you will need to mark where each style part starts in the sequence you create if you use a soft sequencer ( Main A, Main B, Intro A, etc. There is also some CASM and sysex data that needs to be put into the sequence before it can be converted to a working .sty file. This is where programs like Michael P Bedesem's style creator ( freeware ) or One Man Band can be of great assistance, as they do this automatically. Inserting these extras manually is very tedious, and one mistake and the style won't work properly.
Here is one thing to remember as well. The last piece of midi data ( note, cc change, etc ) for each variation needs to stop at the end of the last measure. In other words, if you are doing a 4 measure drum part, dont let any notes sustain into the 5th measure, or you will have a 5 measure style, and the 5th measure will go silent on you. This is where editing in a sequencer can be a big advantage. You just go to the piano roll view for each track and ensure that no data crosses the line between 4th and 5th measure. Of course you can set your style for different length of measures, 2, 8, etc, but the rule is always the same... Cross the line of the ninth measure and your 8 measure style will now be 9 measures long with a blank measure at the end.
If you have never done so, I would recommend opening a style file using XG works or Michael's style maker along with your favorite host soft sequencer, and just taking a look at the way the markers are setup and how the data is applied. It can help give you a better understanding of how a style is actually put together. Even if you are just going to work directly to the keyboard from your controller.. Hope this helps..
AJ
[This message has been edited by Bluezplayer (edited 01-09-2005).]
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AJ