Can I implement an audio spectrum analyzer to my DIY MIDI mixer?

Hello,

For my project I am creating my very own DIY MIDI DJ mixer.

I will be using this instructable to create my mixing board;
http://www.instructables.com/id/A-Fr...tylish-Modula/

Here is an image of what my board will theoretically look like along with the music mixing software I will be using (Traktor);
Attachment 27645

I was curious if I would be able to implement an audio spectrum analyzer (such as the one below) to my mixer board.
Attachment 27644

Here is a link to a video of the audio spectrum analyzer;
https://www.youtube.com/watch?v=w9uCCSE4KBo

The mixing board will have to be connected to a computer with a music mixing software such as Traktor.

If I understand correctly, the microcontroller I'll be using wont be processing the audio. The microcontroller will be using it's I/O pins to control the functions in the music mixing software.

So my question is;

Can I retrieve the frequency of the mp3 file being played on the software without using a microphone?

I was wondering if there was any way that the frequency being displayed can come straight from the mp3 file through MIDI.

I hope this makes sense.

Thank you.

-Kevin