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On Sep 4, 2011, at 6:09 PM, Dirk Laurie wrote: > io.open("file3.wav","w"):write(header3..body1..body2) May I suggest instead: io.open("file3.wav","wb"):write( header3, body1, body2 ) Note the commas. No need to concatenate anything :) http://www.lua.org/manual/5.1/manual.html#pdf-file:write