# Agent Record - Tuned Slit Drum Bank - Runtime: gpt-5.5 Codex CLI - Skills loaded: sheet-metal, instrument-maker - Date executed: 2026-05-21 - Repo: `tonykoop/tuned-slit-drum-bank` ## QMD Queries - `qmd search "Tuned Slit Drum Bank" -c instrument-builds`: returned `qmd://instrument-builds/docs/solidworks/skeletal-modeling-tutorial.md` for a tongue-drum box tutorial. - `qmd search "Tuned Slit Drum Bank" -c instrument-wiki`: returned `qmd://instrument-wiki/sources/legacy-rectangular-tongue-drum.md` and the instrument wiki index tongue-drum classes. - `qmd vector_search "Tuned Slit Drum Bank sheet metal forming bore profile"`: unsupported command. - `qmd get /mnt/c/Users/Tony/Documents/GitHub/handpan/design.md`: returned unrelated WRFCoin economic-design text, likely index mismatch. - `qmd get /mnt/c/Users/Tony/Documents/GitHub/handpan/validation.csv`: document not found. - `qmd get /mnt/c/Users/Tony/Documents/GitHub/handpan/wolfram-starter.wl`: document not found. ## Phase PRs - PR #1: `feat(tuned-slit-drum-bank): license scaffold` - PR #2: `feat(tuned-slit-drum-bank): design model` - PR #3: `feat(tuned-slit-drum-bank): cad and flat patterns` - PR #4: `feat(tuned-slit-drum-bank): fabrication plan` - PR #5: `feat(tuned-slit-drum-bank): validation and risks` - PR #6: `feat(tuned-slit-drum-bank): explorer and readme` ## Major Assumptions - 1.5 mm 1018 cold-rolled steel behaves close enough to the starter beam model for first coupons. - Keeping every box envelope identical is more useful than resizing boxes by pitch for the first prototype. - Secondary tongues are optional color features, not validation-critical notes. - Laser cutting is preferred over plasma if tongue-root quality is poor. ## Coupon Tests Recommended - C3 long tongue coupon. - F#3 middle tongue coupon. - B3 short tongue coupon. - Welded prototype box pitch-shift test. - Rack isolation sustain/cross-talk test. ## Confidence - Acoustic targets: medium-low until C3/F#3/B3 coupons are measured. - Flat patterns: medium for folded boxes and rack. - Fabrication plan: medium. - BOM: medium. ## Retrospective Across the four rounds, the recurring lesson is that the most valuable sprint artifact is not a pretty object description; it is a measurement-ready path from optimistic geometry to honest tuning corrections. Horns, dishes, harps, and slit tongues all need the same discipline: name the coupling assumption, make the first model runnable, isolate prototype variables, and avoid claiming CAD or acoustic authority before coupons and measurements exist. ## Suggested Next-Round Task Build and measure the three-note coupon/prototype set, then update the Wolfram model with empirical root-stiffness and kerf correction factors before cutting the remaining nine boxes.