pull-audio-volume.js

var pull = require('pull-stream')
var audio = require('read-audio')
var clear = require('clear')

var dataThrough = pull.map(function(sample) {
 return sample.data 
})

var rmsThrough = pull.map(function(arr) {
 var squares = arr.map(function(num) {
    return num * num 
 }) 

 var sum = squares.reduce(function(prev, curr) {
  return prev + curr 
 })
 var mean = sum / arr.length

 return Math.sqrt(mean)
})

function amplifierThrough(gain) {
 return pull.map(function(num) {
  return parseInt(num * gain) 
 }) 
}

var toHashThrough = pull.map(function(num) {
 return Array(num).join('#') 
})

var logClearSink = pull.drain(function(num) {
  clear()
  console.log(num);
})

pull(
  audio(),
  dataThrough,
  rmsThrough, 
  amplifierThrough(50),
  toHashThrough,
  logClearSink
)