lfo-for-modv

LFO JS

This project is a little and simple JavaScript library that will implement LFOs in JavaScript.

What is an LFO

LFO stands for Low Frequency Oscillator. It's basically just a device which oscillates between two values on a certain frequency and following a given waveform.

Note: In this library, there is no limitation concerning the frequency, but it can behave strangely at a high frequency

How to use it

Instantiation

First of all, include the LFO script before your other scripts.

<script src="LFO.js"></script>

To create an LFO, you just have to create a new instace of LFO :

var my_lfo = new LFO ();

The LFO function take an object as argument, containing these parameters :

• freq : the frequency of the oscillator
• amplitude : the amplitude of the oscillator
• waveform : the custom waveform function. This function take a number between 0 and 2PI as argument and must return a number between 0 and 1.

Example :

var my_lfo = new LFO ({
	freq: 1.3,
	amplitude: 2,
	waveform: function (x) {
		if (x <= Math.PI) {
			return -1;
		} else {
			return 1;
		}
	}
	//Same as :
	//waveform: "square"
});

This code will create a new LFO with a frequency of 1.3Hz, an amplitude of 2 and which will produce a square signal.

Note: Every parameter is optional

Waveform functions

There are some waveform functions that are preset in the library : sine (default value), triangle, square, sawtooth and noise.

Getting the current value

To retrieve the current value of an LFO, just use the value function :

var v = my_lfo.value();

Changing parameters

To change parameters of an LFO, use the set function which takes the same argument as the constructor of the class :

my_lfo.set({
	freq: 0.7
});

TODO

• Clean up the code
• Make an ES6 module (that's going to be fun)