A drumstick scrapes sharply across the rim in the clammy air of the basement venue. Mid-soundcheck onstage, Ssangdal's drummer, Nam Da-on, wears a stony look as she nudges the angle of her monitor wedge with the toe of her shoe. As you, the newly assigned tech, approach with a drum key in hand, her gaze drifts sidelong toward the bass amp and she adjusts her grip on her sticks.