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Publish the Obsidian vault's Knowledge folder as /knowledge (881 notes, 67 folders), with a Knowledge item in the nav and footer. - scripts/import_knowledge.py regenerates data/knowledge from the vault: slugged paths, folder notes as index pages, wikilinks resolved to site links (or plain text), callouts, highlights, and Dataview tables rendered statically. Personal notes are withheld via an exclusion list plus a privacy guard. - tuftecms/core/knowledge.py builds a concept index from note titles and aliases. First mentions on ordinary pages link to their Knowledge note (capped, never in headings, code, links, or sidenotes); Knowledge pages list related notes and where they're mentioned across the site; other pages get a Related Knowledge block. - Knowledge URLs join sitemap.xml (so the sweep test covers them), never displace existing legacy slugs, list alphabetically, and mermaid diagrams render client-side only on pages that have them.
34 lines
2.3 KiB
Markdown
34 lines
2.3 KiB
Markdown
---
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description: Two from the right, two from the left — the engine room of the roll.
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source: obsidian-knowledge
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---
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# Double Stroke Open Roll
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> *Two from the right, two from the left — the engine room of the roll.*
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---
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## The Rudiment
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The double stroke open roll — often just "the long roll" — is the backbone of rudimental drumming. Each hand plays two strokes before passing to the other, and when those doubles are spaced evenly and accelerated, they close into the sustained roll that defines snare drum vocabulary. Played open and slow, it is a study in clean diddles; played fast and closed, it becomes a smooth, continuous sound. Nearly every numbered roll in the rudiment list is built from this pattern.
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## Sticking
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The standard sticking is a stream of doubles: **RRLL RRLL**. Each pair should sound as two distinct, matched notes when open, tightening as the tempo rises. Practiced open, it builds the second-stroke control that separates a clean roll from a messy one; the challenge is always making that second note of each double as strong and even as the first.
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## How to Play
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There are two schools: the primary-stroke approach, where each note of the double is played with a deliberate wrist or finger stroke for maximum control, and the rebound approach, where the first stroke is struck and the second is a controlled bounce. Most players use wrist-and-finger doubles when open and slow, letting rebound take over as speed increases. Keep the hands relaxed and the two strokes even in height and volume — a weak second stroke is the most common flaw.
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## In Practice
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The double stroke open roll underlies the entire family of measured rolls — the [Five Stroke Roll](/knowledge/music/drum-rudiments/five-stroke-roll), [Seven Stroke Roll](/knowledge/music/drum-rudiments/seven-stroke-roll), [Nine Stroke Roll](/knowledge/music/drum-rudiments/nine-stroke-roll) and beyond — and appears constantly in marching, orchestral, jazz, and kit playing wherever a sustained snare sound is called for. Mastering it unlocks the rest of the list.
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## Related
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- [Five Stroke Roll](/knowledge/music/drum-rudiments/five-stroke-roll)
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- [Seven Stroke Roll](/knowledge/music/drum-rudiments/seven-stroke-roll)
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- [Nine Stroke Roll](/knowledge/music/drum-rudiments/nine-stroke-roll)
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- [Drum Rudiments](/knowledge/music/drum-rudiments)
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