user30743: I want to use the audio from my PC and have it going to the speakers and Arduino for some lighting effects. This project is a bit of a struggle because I don't know what the best way of analysing audio is. So for the lights I only want bass frequencies to affect the lights.

user23997: I have actually just finished a project doing exactly that. I used a frequency analyser chip called an MSGEQ7 (Available from Sparksfun), here's the datasheet.
https://www.sparkfun.com/datasheets/Components/General/MSGEQ7.pdf
These little things are really easy to use. Give me a shout if you would like any help with it such as coding or wiring.

30743: <p>I want to use the audio from my PC and have it going to the speakers and Arduino for some lighting effects. This project is a bit of a struggle because I don't know what the best way of analysing audio is. So for the lights I only want bass frequencies to affect the lights.</p>
 23997: <p>I have actually just finished a project doing exactly that. I used a frequency analyser chip called an MSGEQ7 (Available from Sparksfun), here's the datasheet.</p>

<p><a href="https://www.sparkfun.com/datasheets/Components/General/MSGEQ7.pdf" rel="nofollow noreferrer">https://www.sparkfun.com/datasheets/Components/General/MSGEQ7.pdf</a></p>

<p>These little things are really easy to use. Give me a shout if you would like any help with it such as coding or wiring.</p>
