Test build 18: 2.4-fork4 — twelve DX7 voice banks

SLOOP 2.4.1 plus the owner's additions: twelve banks of 32 DX7 voices by name in PRESETS (D1–D384; banks 1–4 filled with the FM-1's factory voices by the editor itself, 5–12 for your own .syx, several at once), newly claimed banks erased once at first start, hold HOME + PRESETS / KIND to jump by bank, FX → FILTER KEEP. USR4 is 32 KiB on this build. Not a SLOOP release.