def speed(value,type = :set)
      case type
      when :increment then speed_incr(value)
      when :multiply then speed_mult(value)
      else speed_set(value)
      end
    end
def speed(value,type = :set)
      case type
      when :increment then speed_incr(value)
      when :multiply then speed_mult(value)
      else speed_set(value)
      end
    end
Adjusts the current playback speed
 :increment adds <value> to the current speed
 :multiply multiplies the current speed by <value>
 :set sets the current speed to <value>.(default)