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---
breadcrumbs:
- - /chromium-os
- Chromium OS
- - /chromium-os/testing
- Testing Home
page_name: chamelium-usb-audio
title: Chamelium USB Audio
---
[TOC]
## Background
USB audio supports multi-channel and higher precision playback / capture
functionality. This document tells you about how to use chamelium with external
USB audio devices.
## Needed equipment
1. An USB audio device
2. Type-A USB to mini-USB converter
## Setup Steps
1. Run command $ touch /etc/default/.usb_host_mod and reboot chamelium.
2. Run command $ modprobe snd-usb-audio to enable USB audio module.
3. Plug in a USB audio device in the ***middle*** mini-USB port (with
the converter) and use command $ aplay -l ($ arecord -l for
microphone) to check if the device is plugged in.
4. Test your USB audio device by the following command
1. $ arecord -f dat /tmp/test.wav (Test capture function)
2. $ aplay -f dat /tmp/test.was (Test playback function)
## **Recover Steps**
1. Run command $ rm /etc/default/.usb_host_mod and reboot chamelium
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