Thanks to all for the responses, it made clear a few points on that subject, and what I' trying to do (which I know now how thanks to this forum) is to get rid of some percussion sounds which I did not care for, although mos of them sound pretty decent (using the Ketron SD2), but sometimes do no go with the overall sound I want to accomplish (working on a new smooth jazz CD). But I found and tested another way which is a lot faster that trying to edit the file itself. That is by saving the drum midi file as a "separate drum tracks", that way when loaded into whatever sequencer you're using you can get rid of the "offending" tracks in one wack, rather than deleting note by note.
Maybe this info can help somebody else.

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