GM 40-79: one shared bidirectional bore-delay waveguide with per-mode nonlinearity — BOWED (STK stick-slip bow table), LIP (STK brass lip valve), REED (saturating reflection; clarinet bore-invert = odd harmonics), JET (Cook flute). Pizz/harp reuse PLUCK; timpani uses MODAL (Rossing ratios). Data-driven variants (bore length, loss, vibrato). Every program applies bounded per-trigger stochasticism. Validated locally (cc clean + seed- varied). Adds a ±4 KS-buffer safety clamp against a pre-existing pluck-loop runaway (harpsichord/guitar high notes) — proper fix TODO.