GM 96-103 layered synth FX (FM/saw core + noise bed + delay/echo/ring-mod/ S&H; rain uses PhISEM droplets). GM 120-127 sound FX: Cook PhISEM particle model (seashore/applause/breath, real STK Shakers constants), pitch-swept FM bird, gated dual-sine telephone, periodic-AM helicopter, noise+boom gunshot. New engines SYNTHFX, SOUNDFX. Wired reverse-cymbal (119) gap. gm_program_implemented==1 for ALL 0-127. Every program stochastic. Local cc clean, seed-varied, no regression — the full native GM library is complete.