# File lib/xiron/stream.rb, line 225
    def equalizer(hz_, *value_)
      hz = 30
      [30,60,125,250,500,1000,2000,4000,8000,16000].each { |v| hz = v if hz_ >= v }
      if value_[0] != nil
        raise RangeError, "gain out of range" unless (-100..100) === value_[0]
        self["eq_"+hz.to_s+"hz"] = value_[0]
      end
      return self["eq_"+hz.to_s+"hz"]
    end