A trap hi-hat roll is 32nd notes whose velocities are sculpted into accents to make a stuttering texture

The hi-hat roll is trap’s defining sonic signature. Build it by drawing 32nd notes across the bar, then sculpting velocity rather than moving notes: set all notes to a medium base velocity, pick accent points and boost those to full (127), and pull the notes between accents down to 30-50%. The velocity contour is what turns an even 32nd-note stream into a stuttering, rhythmic texture that drives the track. Occasional triplet groupings and open-hat accents add variation. The technique is pure velocity sculpting: the note grid stays uniform while the dynamics create the pattern.

Examples

Draw 32nd-note hats across one bar, all at velocity 60. Boost every 8th-note position to 127. Pull the rest to 40. Add one triplet grouping in the second half. Listen to the stutter.

Assessment

Give the step-by-step procedure for building a trap hi-hat roll using velocity sculpting. Explain why the note grid stays uniform while only velocity changes.