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Crosmando: When using Yamagi with GOG's version the music doesn't work.
mk47at: I don't know where GOG put the music, but Yamagi Quake 2 expects the music files to be named baseq2\music\02.ogg .. baseq2\music\11.ogg
and if it still won't work, try renaming / removing winmm.dll from Quake2 folder