Check this out:
http://audacity.sourceforge.net/

On 8/8/2011 9:03 PM, RussellMc wrote:
>>   Does anyone here know of any
>> good (free if possible) real time spectrum analyzer software for
>> Windows? I want to be able to view what audio is coming out of this
>> guitar interface.
>>     =20
> Mayhaps
>
> PC soundcard based:
>
>             http://www.techmind.org/audio/#specanaly
>
>           From:  http://www.techmind.org/audio/#intro
>
>
> Mod for DC response
> YMMV
> Caveat Emptor
>
>       http://blog.makezine.com/archive/2008/05/how-to-modify-a-pc-sound.h=
tml
>
> Related
>
>       http://www.edaboard.com/thread136601.html
>
> Zelscope $10
>
>      http://www.zelscope.com/
>
> TrueRTA
> Versions for $0
>
>     http://www.trueaudio.com/rta_abt1.htm
>
> Legion
>
>       http://www.dxzone.com/catalog/Software/Spectrum_analyzers/
>
> Virtins
> 21 day trial free
>
>          http://www.virtins.com/
>   =20
--=20
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