Hachigatsu is correct.Godzilla did have a sound recordist, a sound effects engineer and a sound mixer.

I think that the original Godzilla/Gojira showcases better effects than most later entries in the series.Apparently the dark,flickering B&W images hide the effects' shortcomings,but anyway,the 1954 Gojira looks like a lavish production next to,say,Godzilla Raids again or Godzilla vs Megalon.