# Decision Record ## Decisions - Treat the daxophone as a bowed wooden-tongue friction idiophone with contact pickup support. - Keep the clamp, tongue, dax block, and pickup as separate design subsystems. - Promote this packet from V5 L1 to L2 planning by adding subsystem shop interfaces, a non-dimensional cut/workpiece list, and explicit prototype evidence gates. - Keep the packet below build-ready because no measured tongue blank, clamp test, dax-contact test, or pickup test exists. - Record every artifact as `concept_only` or `pending_measurement`. - Do not create CAD, DXF, tongue profiles, fret maps, pitch tables, pickup placement, or dimensions in this pass. ## Open Questions - Which real wood blank and grain orientation will define the first prototype? - What clamp interface holds reliably without crushing the tongue? - What dax-block face shape and surface finish provide useful expression? - Where can a contact pickup be mounted without becoming undocumented structure? - How should bowing response be measured separately from amplifier coloration? - What safety treatment prevents splinters or sharp bowed edges while preserving friction response? ## Promotion Gates - L2 is satisfied by this planning handoff: subsystem boundaries, BOM classes, cut/workpiece categories, and authority constraints are explicit. - L3 requires reviewed fabrication authority and repeatable prototype response. - L4 requires empirical playing data, recordings or measurements, and documented revisions. ## L2 Evidence Gates - Measure and photograph the first tongue blank before shaping. - Log clamp stability, buzz, slip, and fiber damage risk separately from bowing behavior. - Test dax-face contact on a coupon before claiming any contact map or fret-like behavior. - Record pickup mounting reversibility, handling noise, and whether the pickup changes the mechanical response. - Update the authority register before future CAD, DXF, SVG, pickup layout, or audio artifacts are treated as anything beyond concept review.