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Rogue Amoeba’s SoundSource 2.5, with added command line tool for switching audio devices and setting volume.
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README.md

SoundSource

This project contains a version of Rogue Amoeba's SoundSource 2.5 with an added command line tool for switching audio devices and setting volume.

If you want a graphical version of SoundSource, you can get one from Rogue Amoeba. Current versions of Rogue Amoeba's SoundSource are commercial products, not open source.

The command line tool has no man page yet, but here's a simple example of how to use it:

% soundsource -h
usage: soundsource [-ios] [device]
   or: soundsource [-IOS] volume
   or: soundsource [-Mm]
  -i         display selected audio input device
  -o         display selected audio output device
  -s         display output device used for alert sounds, sound effects
  -i device  set selected audio input device
  -o device  set selected audio output device
  -s device  set output device used for alert sounds, sound effects
  -I         display selected audio input device's volume
  -O         display selected audio output device's volume
  -S         display alert sounds/sound effects volume
  -I volume  set selected audio input device's volume
  -O volume  set selected audio output device's volume
  -S volume  set alert sounds/sound effects volume
  -M         mute selected audio output device
  -m         unmute selected audio output device
With no arguments, displays available/selected (*) devices and volumes.
% soundsource
Output (volume 0.001):
  AirPlay: Furrball
  AirPlay: Furrball II
* Andrea PureAudio USB-SA Headset
  BW900 HS
  Internal Speakers
  Soundflower (16ch)
  Soundflower (2ch)
  ZoomSwitch USB Adapter
Input (volume 0.926):
  Andrea PureAudio USB-SA Headset: External Line Connector
  Andrea PureAudio USB-SA Headset: External SPDIF Interface
* Andrea PureAudio USB-SA Headset: Microphone
  BW900 HS
  Line In
  Soundflower (16ch)
  Soundflower (2ch)
  ZoomSwitch USB Adapter
System (volume 0.989):
* Internal Speakers
% soundsource -i
Andrea PureAudio USB-SA Headset: Microphone
% soundsource -o
Andrea PureAudio USB-SA Headset
% soundsource -s
Internal Speakers
% soundsource -o 'Internal Speakers'
% soundsource -o
Internal Speakers
% soundsource -O 0.8
% soundsource -O    
0.802

A few examples of using soundsource in scripts are on my blog.

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