AFAIK is acronym for "as far as i know"
Did You try:
Qt Code: 
  1. sound = new QSound("/home/martin/Documentos/Programas Qt/M/mClock/mClock 1.4/alarm1.wav",this);
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also put it in constructor of the class to be sure that the code is executed.
Did You try playing it in external sound player, is this valid .wav file?