whole_func_string: function() {
        if (!volume || volume.level >= 1) {
          return;
        }
  
        var newVolume = Math.min(volume.level + volumeStep, 1);
  
        p.setVolume(newVolume, function(err, status) {
          if (err) {
            return;
          }
  
          debug("volume up: %s", status.level);
  
          volume = status;
        });
      }
func_code_string: function() {
        if (!volume || volume.level >= 1) {
          return;
        }
  
        var newVolume = Math.min(volume.level + volumeStep, 1);
  
        p.setVolume(newVolume, function(err, status) {
          if (err) {
            return;
          }
  
          debug("volume up: %s", status.level);
  
          volume = status;
        });
      }
func_documentation_string: volume up