Audio

The Kumquat offers two 3.5mm TRS jacks to access the audio interface. This document will demonstate how to play and record audio using the alsa-utils.

Location	Color	Description	Pinout
X8		Headphone Out
X9		Microphone In

Prerequisites

Before you begin, make sure you have the following:

Headphones or Headset with 3.5mm Audio connector
Microphone with 3.5mm Audio connector

Hardware Setup

Connect the Headphones or Headset to the green Headphone jack on the Kumquat
Connect the Microphone to the pink Microphone jack on the Kumquat

Playing Audio

First copy an audio file onto the device. In this example the wget command, which requires an internet connection, will be used. You can however use other methods to copy an audio file onto the device.
Use the following command to download an audio file onto the device.

wget http://www2.cs.uic.edu/~i101/SoundFiles/PinkPanther60.wav

Enable the audio output using the following command

amixer -c 0 sset 'Headphone',0 50% on

Play the audio file.

aplay PinkPanther60.wav

Recording Audio

Enable the microphone input using the following command

amixer -c 0 sset 'Mic1',0 50% on cap

Record the audio file

arecord -d 10 -f cd -t wav recording.wav

Playback the recording using "aplay"

aplay recording.wav

Playing Internet Radio

Enable the audio output using the following command

amixer -c 0 sset 'Headphone',0 50% on

Play a internet stream using mpv

mpv --demuxer-readahead-secs=5 --demuxer-max-bytes=4M --demuxer-max-back-bytes=2M --audio-buffer=5 http://radio4.cdm-radio.com:8020/stream-mp3-Chill_autodj

Checkout https://dir.xiph.org/ for other stream urls

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