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I would like to modify the pitch of my audio output.

I know you can use software such as PlayItSlowly to listen to an audio file and alter the pitch in the process, but what I am looking for is a way to modify the pitch just as I do with the volume.

I can do it on Windows with Realtek's sound manager, so I guess there must be a way to do it on Linux as well.

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Install ALSA equalizer plugin:

sudo apt-get install libasound2-plugin-equal

Prepare your .asoundrs file, so that ALSA will know about the plugin:

gedit .asoundrc

Paste inside it (or append at the end, if it already contains some data):

ctl.equal {
   type equal;

pcm.plugequal {
    type equal;
   slave.pcm "plughw:0,0";

    type plug;
    slave.pcm plugequal;

Save the file and exit.

Next, reload ALSA:

sudo alsa force-reload

Your equalizer should be set-up. To use it, run

alsamixer -D equal

TADA! Your alsamixer will now behave as an equalizer, instead of adjusting volumes. Hope this helps!

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Use the alsa-mixer

Open a terminal and type sudo apt-get install gnome-alsamixer alsamixergui libasound2-plugin-equal alsa-utils

enter image description here

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I have tried really hard to understand what you meant, but I don't see where alsa-mixer does something else than adjusting volumes ... – user1092407 Apr 15 '12 at 8:55

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