From 748d1f76aaaa618502470723da702044456d351b Mon Sep 17 00:00:00 2001
From: gabucino
2.3.2.2.5. Software volume control
+ +This plugin is a software replacement for the volume control, and
+ can be used in machines with broken mixer device. It can also be
+ used if one wants to change the output volume from MPlayer
+ without changing the PCM volume setting in the mixer. It has one
+ switch volume
that is used for setting the initial
+ sound level. The initial sound level can be set to values between 0
+ and 255 and defaults to 255. Use this plugin with caution since it
+ can reduce the signal to noise ratio of the sound. In most cases it
+ is best to set the level for the PCM sound to max, leave this plugin
+ out and control the output level to your speakers with the mixers
+ master volume control. If there is an external amplifier connected
+ to the computer (this is almost always the case), the noise level
+ can be minimized by adjusting the master level and the volume knob
+ on the amplifier until the hissing noise in the background is gone.
+
Usage :
+ mplayer media.avi -aop
+ list=volume:volume=<0-255>
+