MATLAB: Problem with solving overlapping sounds

audioaudioplayeroverlapsound

I'm currently trying to give my matlab game sound. To stop the sounds from overlapping I found a solution and changed the data accordingly.
SOUND_FILE_NAMES = {'.\sounds\pacman_beginning.wav', '.\sounds\pacman_chomp.wav', ...
                    '.\sounds\pacman_death.wav', '.\sounds\pacman_eatfruit.wav', ...
                    '.\sounds\pacman_eatghost.wav', '.\sounds\pacman_extrapac.wav', ...
                    '.\sounds\pacman_intermission.wav', '.\sounds\pacman_moving.wav'};
SOUND_KEYS = {'Beginning', 'chomp', 'death', 'eatfruit', 'eatghost', ...
                      'extrapac', 'intermission', 'moving'};
SOUND_SAMPLES = [5,5,5,3,3,2,6,5];
obj.audioPlayers = struct();
        for i = 1 : length( SOUND_FILE_NAMES )
            [y, Fs] = audioread(SOUND_FILE_NAMES{i});
            str = 'audioplayer(y,Fs)';
            for j = 2 : SOUND_SAMPLES(i);
                str = sprintf('%s, audioplayer(y,Fs)', str );
            end
            eval( sprintf('obj.audioPlayers.(SOUND_KEYS{i}) = {%s};', str ));
          end
PlaySound(obj,'Beginning');
and the function
function PlaySound( obj, soundName )
          done = false;
          i = 1;
          while ~done && i < length(obj.(soundName))
              if ~obj.(soundName){i}.isplaying()
                  obj.(soundName){i}.play();
                  done = true;
              end
              i = i + 1;
          end
  end
But I only get the error
Reference to non-existent field 'Beginning' 
Error in PlaySound (line 7)
          while ~done && i < length(obj.(soundName))
I don't know how to solve this problem.

Best Answer

Found the problem :
obj.(soundName)
should be
obj.audioPlayers.(soundName)
since that's where everything was saved in the script.
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