+H: -a Set the amplification value (0-255). This determines a scaling
+H: factor by which the amplitude should be multiplied in order to
+H: normalize the volume of the audio file. A value of zero means
+H: no amplification, 64 means the amplitude should be multiplied
+H: by a factor of two, 128 by three and so on.
+H:
+H: This value is used by the amp filter.
+H: