Perhaps this is covered elsewhere, but the listing for sound_effect is:
VAR:245 15 5/3 sound_effect number effect volume
Isn't the version info in X/Y format supposed to indicate that sound_effect is a V5 opcode, but the earliest version seen in Infocom stories is V3. Shouldn't this just be 3? I have seen it also in V4 files as well. Thx.