Suggestions for auto-wah, modulating wah??

snoof · December 06, 2006, 10:06:49 AM

Looking for sugestions for a not-too-difficult auto-wah/modulating wah. Similar idea to a trem, but wah instead; in that you set the rate of the automatic "wah-wahing". The Boss auto-wah has a setting like this if I remember right. Any suggestions??

Scott

Mark Hammer · December 06, 2006, 10:08:22 AM

IIRC, isn't the ROG Phozer a modulated bandpass filter?

snoof · December 06, 2006, 11:05:09 AM

I checked that one out, but I was looking for a "wah" sound as opposed to a phaser though. The clips sounded like a phaser to me.

ke4unr · December 06, 2006, 03:26:03 PM

http://www.generalguitargadgets.com/index.php?%20option=content&task=view&id=138&Itemid=153

Maybe the DOD 440 Envelope Filter clone at GGG?

Not a true "auto wah", but check out the sound clip and see if that's what you're after.

This one is on my list to build.

Ray K.

zeta55 · December 06, 2006, 04:24:27 PM

Maybe this on http://members.shaw.ca/roma/wah-two.html check out the running wah at the bottom of the page.

/Krister

snoof · December 06, 2006, 04:27:59 PM

The DOD is more of Mutron III auto wah effect (envelope follower). If my terminology is correct here, I'm looking for a LFO modulated Crybaby ckt with adjustable speed kinda thang

I guess my use of "auto-wah" is not technically correct. I meant "automatic wah", as in it's being automaticaly wahed for you.

snoof · December 06, 2006, 04:31:36 PM

Quote from: zeta55 on December 06, 2006, 04:24:27 PM
Maybe this on http://members.shaw.ca/roma/wah-two.html check out the running wah at the bottom of the page.

/Krister

Yes, this is the kinda thing i'm after. Thnxs! I think I heard a clip somewhere that was using the "idiot wah" ckt, modulated by something??

mdh · December 06, 2006, 04:49:10 PM

Quote from: snoof on December 06, 2006, 04:31:36 PM
Yes, this is the kinda thing i'm after. Thnxs! I think I heard a clip somewhere that was using the "idiot wah" ckt, modulated by something??

The original ROG Phozer was Tim Escobedo's Idiot Wah modulated by an LFO (I believe the one from the EA Tremolo). The schematic is still on runoffgroove.com, IIRC, but I think the link to it in the Phozer 2 article is broken. I seem to remember that I successfully guessed the filename after a few attempts, but I don't remember exactly what it was.

snoof · December 06, 2006, 04:59:15 PM

yep. I saw that as well, and the link takes you to homewrecker, but the phozer isn't listed...

snoof · December 06, 2006, 05:20:13 PM

aha! I found the clip I was referring to on this page (idiot wah)

http://www.home-wrecker.com/salvo.html

and the schem here...

http://www.geocities.com/tpe123/folkurban/fuzz/snippets.html

how would one implement the LDR talked about in the description?? I've never worked with any modulation type effects before

Edit: found the old version of the phozer from archive.org http://web.archive.org/web/20040603163912/www.runoffgroove.com/phozer.html

mdh · December 06, 2006, 06:11:01 PM

Go to Geofex and read R.G.'s article on wah pedals (in the FX Technology section). That should clarify things a bit. The photon filter isn't exactly what you're looking for in and of itself. You would still need an LFO to vary the resistance of the LDR, thus modulating the wah.

BTW, the old phozer schematic is available on runoffgroove.com, but the filename is simply "phozer.png," not "old-phozer.png."

Meanderthal · December 06, 2006, 09:35:56 PM

Many moons ago I had an old Ibanez script logo phaser- one knob. At the time I didn't like it much because it sounded just like a wah. I wanted it to sound like a PHASER! Anyway, if anyone know what I'm talking about and has a schematic for it, that might be what you're after...

boogietube · December 06, 2006, 10:49:34 PM

There's a Mutron Autowah new in the very first Layouts Gallery page

moosapotamus · December 07, 2006, 01:49:24 PM

Quote from: snoof on December 06, 2006, 05:20:13 PM
how would one implement the LDR talked about in the description?? I've never worked with any modulation type effects before

Take a look at the Tremulus Lune. The LFO drives an LED. If you want to use it to drive the Photon Filter, don't bother with the input and output sections. Lune LFO + Photon Filter =

~ Charlie

Mark Hammer · December 07, 2006, 02:01:09 PM

The MXR Auto-Q is essentially an MXR Envelope Filter with a few bells and whistles, one of them being the capacity to mix on-board LFO control and envelope control. It's actually a pretty neat pedal that I wouldn't mind owning if my money didn't have to go other places. The new Guyatone Ultron pedal, reviewed in the current newsstand issue of Guitar Player is also a modulated Mutron-type pedal. You may want to try out one or both of these at a stiore to have a better sense of what features you like or aspects you like. My guess is that whatever you end up with as a DIY pedal, you will not be able to use a single canned PCB layout/project, so best to have a keener sense of what you want this to be able to do.

Paul Marossy · December 07, 2006, 02:44:18 PM

I like Tim Escobedo's "Phuncgnosis". It's an auto-wah type thing.

snoof · December 07, 2006, 04:21:13 PM

Quote from: Mark Hammer on December 07, 2006, 02:01:09 PM
The MXR Auto-Q is essentially an MXR Envelope Filter with a few bells and whistles, one of them being the capacity to mix on-board LFO control and envelope control. It's actually a pretty neat pedal that I wouldn't mind owning if my money didn't have to go other places. The new Guyatone Ultron pedal, reviewed in the current newsstand issue of Guitar Player is also a modulated Mutron-type pedal. You may want to try out one or both of these at a stiore to have a better sense of what features you like or aspects you like. My guess is that whatever you end up with as a DIY pedal, you will not be able to use a single canned PCB layout/project, so best to have a keener sense of what you want this to be able to do.

I've got a Q-Tron, so I've got the traditional envelope-filter sounds covered so I don't need that sound. I used to own a Boss AW-2, and that had a setting where you could set the speed of a continuously cycling wah,(footless wah) and that's what I'm after. It looks like I have some good ideas from the posts above, I just need to implement them into something that sounds descent...

snoof · December 07, 2006, 04:22:47 PM

Quote from: moosapotamus on December 07, 2006, 01:49:24 PM
Quote from: snoof on December 06, 2006, 05:20:13 PM
how would one implement the LDR talked about in the description?? I've never worked with any modulation type effects before

Take a look at the Tremulus Lune. The LFO drives an LED. If you want to use it to drive the Photon Filter, don't bother with the input and output sections. Lune LFO + Photon Filter =

~ Charlie

Very nice schem!! I like how the sections are defined. Thanks man!

slacker · December 07, 2006, 06:03:04 PM

I don't mean to pimp my own design and it might be a more complicated than you were looking for but my slackfilter does exactly what you want.
It's a filter with envelope or LFO control and can do LFO driven wah type sounds.
Have a look at this thread for more information
http://www.diystompboxes.com/smfforum/index.php?topic=45148.0

searoad · December 07, 2006, 09:48:35 PM

like the Worm?
http://www.youtube.com/watch?v=Nlqw_lX9xr8
the feature he shows at 2:00?

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Suggestions for auto-wah, modulating wah??