My Pi 3 Install Log (4): Audio config on Raspbian

Notes reading book pi for secret agents
{
# pi audio setup

cat /proc/asound/cards

ls -l /proc/asound

alsamixer

amixer cset numid=3 1: # set audio out to 3.5mm analog jack

amixer cset numid=3 2: # set audio out to HDMI cable

# test speakers

speaker-test -c2 -t wav

alsamixer -c1 # card 1

# test microphone

sudo apt-get install sox libsox-fmt-mp3

sox -t alsa plughw:1 -d # start a monitoring loop

# writing to a WAV file

sox -t alsa plughw:1 myrec.wav # record

sox myrec.wav -d # playback

sox myrec.wav -t alsa plughw:1 # playback from usb audio device output

# mp3 and ogg

sudo apt-get install lame vorbis-tools

lame myrec.wav # wav -> mp3

oggenc myrec.wav # wav -> ogg

sox -t alsa plughw:1 -t wav - | lame - myrec.mp3 # record as mp3

sox -t alsa plughw:1 -t wav - | oggenc - -o myrec.ogg # record as ogg

sox myrec.mp3 -d # playback mp3

# shortcut

alias record='sox -t alsa plughw:1 -t wav - | lame -'

record newrec.mp3

# terminal multiplex

sudo apt-get install tmux

# what is

sudo nano /boot/cmdline.txt
}

From github a japanese shared, pi's audio recording

{

apt-get install alsa-utils # what for

lsusb # list usb devices

arecord -l # list of CAPTURE hardware devices

export AUDIODRIVER=alsa

AUDIODEV=plughw:1,0 rec test.mp3

AUDIODEV=plughw:0,0 play test.mp3

AUDIODEV=plughw:1,0 play test.mp3

}

On my pi then do,

$ sudo apt-get install sox libsox-fmt-mp3 alsa-utils lame vorbis-tools

# alsa already exists on raspbian

$ sudo apt-get install tmux flac

my preferred format flac now played by sox, too.  But board 3.5mm bad quality - quite noticeable electrical noise.

Using alsamixer my soundblaster usb soundcard was recognized but tried sox a flac no sound. This is what I want to make it works.