On a regular beat in bluegrass, the banjo, mandolin and guitar normally NEVER play full chords on the downbeat, but there are times (hits, holds, etc.) where this precisely what is needed. If I add these hits to style variation, they will play at times when they are not appropriate. I need to be able to add a pattern mask to trigger these full chords ONLY on hits or holds, when I want them, and NEVER play any other time.