# Faust: Parallel Composition

Parallel processes in Faust are separated with the , operator. The following example uses two square wave oscillators, each passing through a lowpass filter. These chains are running in parallel, creating an output signal with two channels for the left and right audio output:

This example is a parallel combination of two sequential compositions. In Faust syntax, these need to be put in parenthesis.

Load this example in the Faust online IDE for a quick start:

import("stdfaust.lib");

freq  = hslider("Cutoff Frequency",100, 10, 1000, 0.001);

sig1  = os.square(50);
sig2  = os.square(70);

filt = fi.lowpass(5,freq);

process = (sig1:filt),(sig2:filt);