On Tue 28 Sep 2021 at 13:49:37 (-0700), pe...@easthope.ca wrote:
> From: ghe2001 <ghe2...@protonmail.com>
> Date: Tue, 28 Sep 2021 17:24:57 +0000
> > Try alsamixer. You can select the audio device there. It works for my
>
> >From the alsamixer manual,
> "DESCRIPTION
> alsamixer is an ncurses mixer program for use with the ALSA soundcard
> drivers. It supports multiple soundcards with multiple devices."
>
> A terminal with an ncurses display is necessary to listen to an audio message?
No, you'd use alsamixer where you were taking an active rôle during
record/playback, or for discovering, inspecting and setting up a
system. Typically, you'd play "an audio message", or anything else,
with some sort of application, unless it was a disembodied
notification, say.
Some applications include volume/balance controls and so on; others
don't. I have keys set up for adjusting the volume on the various
controls, using the multimedia keys XF86Audio{Mute,LowerVolume,RaiseVolume}
(F1/F2/F3 where not present), with Ctrl/Alt/Shift to select between
Master/Speakers/Headphones/PCM.
> Now that the PCI sound card is gone, disambiguation appears to be unnecessary.
> This command works.
> play a42.WAV
>
> Something odd in the sox manual.
> -d, --default-device
> This can be used in place of an input or output filename to
> specify that the default audio device (if one has been built
> into SoX) is to be used. This is akin to invoking rec or play
> (as described above).
>
> What is the sense in telling a software to use a default? In absence of
> an output specification, what else would be used?
How otherwise would you make explicit what you're happy to use
implicitly? (When I write a script, I try to be as explicit as
possible, avoiding short-cuts, abbreviations, assumptions, etc.)
> peter@joule:/home/peter$ sox /home/peter/a42.WAV /dev/snd/pcmC0D0c
> sox FAIL formats: can't determine type of `/dev/snd/pcmC0D0c'
>
> Can sox specify a sound device for output?
Yes: sox /home/peter/a42.WAV -t alsa default
I define a function that saves typing, which I use when I'm checking
effects/timings etc.
function soxy {
[ -z "$1" ] && printf '%s\n' "Usage: ${FUNCNAME[0]}
path-to/sound-file-of-any-type [trim 20 2]
runs sox to play the file with any arguments given.
The example is a reminder for arguments in full." >&2 && return 1
local From="$1"
shift
sox -q "$From" -t alsa default "$@"
}
Cheers,
David.
