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;
      });
    }
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;
      });
    }
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 ; } ) ; }
volume up
volume up