Documentation: http://ignis.wtf/audio_loopback/

Along with pyaudio, this project is supposed to work together with VB-Audio's Cable on Windows. Supports Linux with pulse too.

This is meant to be integrated to other software, but you can run the module directly.

usage: audio_loopback.py [-h] [-v] [-c COUNT] [-r REDUCTION] [-k CONSTANT]

Audio loopback capture, FFT

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose         Set verbosity level
  -c COUNT, --count COUNT
                        Count to reduce the array size to
  -r REDUCTION, --reduction REDUCTION
                        Reduction coefficient
  -k CONSTANT, --constant CONSTANT
                        Constant to multiply output with

• Install VB-Audio Cable
• Go to Windows Sound Settings, Playback Devices.
• Make sure CABLE Input is not your default playback device.
• Go to Windows Sound Settings, Recording Devices.
• Go to CABLE Output's properties.
• Under "Listen" tab, check "Listen to this device"
• Set "Playback through this device" to "Default Playback Device"
• Under "Levels" tab, set both "CABLE Output" and "Wave In Volume" to 100%.
• Save settings and close.

• Install imports with pip.
• Install pavucontrol.
• Change the device being recorded to "Monitor of your_output_device"

Follow this guide to change the sound device your application is feeding output to. If you are not hearing output from the application after this, make sure you read How to set up part, and set the "listen" settings properly.

• Go to Windows Sound Settings, Playback Devices.
• Set CABLE Input as your default playback device.
• Go to Windows Sound Settings, Recording Devices.
• Go to CABLE Output's properties.
• Under "Listen" tab, check "Listen to this device"
• Set "Playback through this device" to your speakers/headphone.
• Under "Levels" tab, set both "CABLE Output" and "Wave In Volume" to 100%.
• Save settings and close.