Near real-time microphone effects (amplify, pitch, etc.)

You can increase the gain from your microphone in (almost) real-time.

$ sudo apt-get install sox libsox-fmt-pulse pavucontrol
$ pactl load-module module-null-sink
$ sox -t pulseaudio alsa_input.usb-ZOOM_Corporation_H5_000000000000-00.multichannel-input -t pulseaudio null gain 30
 
Replace "alsa_input.usb-ZOOM_Corporation_H5_000000000000-00.multichannel-input" with your device, or simply default if you want to use your built-in mic. To find out the name of your input, use:

$ pactl list
 
It will work for all kinds of other transformations, like changing the pitch of your voice:

pitch -800

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