[LAU] Wah update

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To: <Linux-audio-user@...>
Date: Monday, July 20, 2009 - 3:11 am

Just a quick update on the wah research.

A friend owns a Dunlop "Jimi Hendrix Wah", which says it is the "Original Thomas Design", by which I assume they mean to claim it's the same design as the Thomas Organ Wah, formerly Vox.

This website's describes the frequency response as a lowpass with a resonant peak:
http://www.geofex.com/Article_Folders/wahpedl/wahped.htm

So here is what JAPA says it does (and I believe JAPA more than some random website):

When fully closed, it's a bandpass, with a VERY high Q!
http://restivo.org/misc/lowend-jimi.png

But, wait, when I open it up, suddenly it becomes more like a highpass, but with a lot of resonance:
http://restivo.org/misc/midrange-jimi.png

When it's fully opened, it's definitely a highpass, but with a helluva peak:
http://restivo.org/misc/high-jimi.png

So, not only is the opposite of what that article says, but it's also kind of non-linear. I'll poke around the various LADSPA plugins and see if I can find something nearly like this.

Another guitar-player friend has a different wah (IIRC, either a "Cry Baby", or a Morley), and I'll see if I can run his through this and see what it comes up looking like.

-ken
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Messages in current thread:
[LAU] Wah update, Ken Restivo, (Mon Jul 20, 3:11 am)
Re: [LAU] Wah update, Andres Cabrera, (Mon Jul 20, 1:07 pm)
Re: [LAU] Wah update, Fons Adriaensen, (Mon Jul 20, 10:59 pm)
Re: [LAU] Wah update, Fons Adriaensen, (Mon Jul 20, 9:57 am)
Re: [LAU] Wah update, Ken Restivo, (Tue Jul 21, 12:12 am)
Re: [LAU] Wah update, Bill Allen, (Thu Jul 23, 10:21 pm)
Re: [LAU] Wah update, Carlos Sanchiavedraz, (Tue Jul 21, 3:56 pm)
Re: [LAU] Wah update, Ken Restivo, (Fri Aug 14, 8:00 pm)
Re: [LAU] Wah update, hermann, (Sat Aug 15, 12:14 pm)
Re: [LAU] Wah update, Arnold Krille, (Fri Aug 14, 8:43 pm)
Re: [LAU] Wah update, Folderol, (Fri Aug 14, 9:19 pm)
Re: [LAU] Wah update, Ken Restivo, (Fri Aug 21, 12:22 am)
Re: [LAU] Wah update, Folderol, (Fri Aug 21, 10:12 pm)
Re: [LAU] Wah update, James Cameron, (Fri Aug 21, 12:29 am)
Re: [LAU] Wah update, Fons Adriaensen, (Tue Jul 21, 1:44 pm)
Re: [LAU] Wah update, Paul Coccoli, (Wed Jul 22, 8:18 pm)
Re: [LAU] Wah update, Julien Claassen, (Mon Jul 20, 6:11 am)
Re: [LAU] Wah update, Ken Restivo, (Mon Jul 20, 6:48 am)
Re: [LAU] Wah update, Julien Claassen, (Mon Jul 20, 7:46 am)
Re: [LAU] Wah update, Justin Smith, (Mon Jul 20, 4:32 am)
Re: [LAU] Wah update, Ken Restivo, (Mon Jul 20, 5:25 am)
Re: [LAU] Wah update, Justin Smith, (Mon Jul 20, 5:33 am)
Re: [LAU] Wah update, Justin Smith, (Mon Jul 20, 5:37 am)