I always figured it was a matter of timing. If you have good timing, you set a beat and then apply half-steps for the long beat, normal beats for the short. Just like over telegraph lines.
Of course, if you have lousy timing, you'll never figure out which are the long and which are the short, which is why some people can do it and others can't.
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Of course, if you have lousy timing, you'll never figure out which are the long and which are the short, which is why some people can do it and others can't.