Using Slurs in Fiddle Tunes
Here’s one thing that can throw off your pick direction in a fiddle tune: slurs, otherwise known as hammer-ons, pull-offs, and slides. Play through Examples 7 and 8 and notice that the slur takes place of a pick stroke.
To maintain the right pick direction, you’ll have to follow the missing pick stroke with the correct stroke. If the slur takes the place of a downstroke, as in Example 7, you’ll follow it with an upstroke. And if the slur takes the place of an upstroke, as in Example 8, follow it with a downstroke. One way to ensure you get this right is to actually move your pick above the strings as you play the slur.
Excerpted from Bluegrass Guitar Essentials