Originally Posted by
foldedpath
Makes perfect sense and it's a good question.
For reels, I try to begin each significant phrase in a tune, and the start of an A or B section with a downstroke. After that, I use straight alternating picking, including treble ornaments or actual triplets within the tune. This can mean beginning a treble or triplet with either a downstroke or upstroke, depending on where it falls within the phrase. With enough practice that becomes routine.
Within that alternating picking pattern, I'll emphasize certain notes depending on what the reel needs for a rhythm pulse. Sometimes it's a pulse on 1 and 3, sometimes it's more of a subtle backbeat feel on 2 and 4. Others may do this differently, but alternate picking is the only way I've found to get up to full dance tempos with reels.
On some reels, the notes fly by so fast that I don't even get to start a phrase with a downstroke, and it's just constant alternate picking, but I try to keep that in mind. And I always try to make sure I'm adding some kind of rhythm pulse within the flurry of notes.