A set of Node.js tools to load/save/slice/transpose .WAV audio file. I do not maintain those helpers, they were made for my granular synthesizer engine and it has since been rewritten in Golang.
const W = require ('W')
const wavFile = new W('path/to/file.wav')
// Checks if the file headers are properly set
wavFile.isValid()
// Gets a sample of n ms at offset ms
wavFile.getWindow(n, offset)
const slice = wavFile(5400, 25000) // gets 0:00:25.000-0:00:30.400
// Speeds up playback rate by x, and transpose
wavFile.transpose(x)
const doubleSpeedOctaveUp = wavFile.transpose(2)
const littleSlower = wavFile.transpose(0.75)
// Saves file (recreates valid WAV headers)
wavFile.save()
wavFile.transpose(1.2).save()