# Routing audio

One of my personal requirements for a _live coding_ system with SuperCollider is
that I want to route audio to other applications. I often use my _live coding_
system as a way to generate raw materials that go through various audio busses
for post-mixing and live audio effects controlled through MIDI controllers.
During the [setup](recommended.md) phase, I have encouraged you to install an
application that allows the creation of virtual audio busses. That's where it is
finally used.

The `Boot` pseudo-class is seting up the audio to output to 16 channels. You can
think of it as 8 stereo channels with 2 channels each. If you like quadriphony
or octophony, you can also use 4 or 8 channels at a time. The routing of audio
in the host application is entirely up to you but the gest of it is that you can
now record / post-process the sound in any way you want.

![](https://livecoding.fr/images/reaper_supercollider_1.png)

# Sending audio to a bus

The `.play` method used by JITLib allows you to decide which output bus is going
to be used. All you have to do is to add some argument when calling the method:

```supercollider
~foo = { SinOsc.ar(200) ! 2 * 0.5 };
~foo.play(fadeTime: 4, out: 4);
```

This code snippet will play a sine wave on bus 5 and 6. Remember that the first bus is 0.