linux-vol 
Get and set volume in Linux systems.
Install
$ npm install --save linux-vol
Usage
var linuxVol = require('linux-vol');
linuxVol.get(function (err, level) {
console.log(level);
//=> 0.45
});
linuxVol.set(0.65, function (err) {
console.log('Changed volume to 65%');
});API
.get(callback)
Get volume level.
callback(err, level)
Type: function
level
Type: number
Current volume level.
.set(level, callback)
Set volume level.
level
Required
Type: number
A number between 0 and `1.
callback(err)
Type: function
Returns nothing but a possible exception.
CLI
See the vol CLI.
License
MIT © Andreas Gillström