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Fretboard string lists and Fingering positions/string-names now read low-to-high (lowest-pitched string first), matching how chord diagrams and tablature are conventionally written. Pass high_to_low=True to any fretboard constructor to restore the pre-0.43 high-to-low behavior. Design: each board keeps a private canonical (high-to-low) tone store so the fingering scorer and GUITAR_OVERRIDES table stay untouched; a single _orient() helper re-orients at the user-facing boundary (and, being self-inverse, also canonicalizes custom tuning/position input). Fingering carries its own orientation flag and presents oriented positions/names via properties. The fingering cache key now includes orientation so the two orderings don't collide. to_tab() and Part.strum() now sort by pitch internally, so their output is identical regardless of board orientation. - All 25 instrument presets gain a high_to_low param, routed through a canonical build path. - Tests updated for the new default; added orientation-specific tests. - Docs/examples flipped to low-to-high; chord_charts.py example now uses the built-in Fingering.tab() instead of a hand-rolled renderer. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>