What kind of pedal would one use to duplicate....

[pianotuner steveo]

I am trying to figure out what pedal can be used to make the constant na na na na na na na na droning of the organ on The Who's "Won't Get Fooled Again"

Would  this be some kind of wah wah pedal that is automatic? It has a phase shifting sound and that repeating sound together. Forgive my ignorance, I have very little experience with pedals except a flanger and that isn't the right sound.

[coolkeys]

Won't Get Fooled Again
Equipment used -Lowrey Berkshire TB0-1/EMS VCS3

Pete is playing block chords spread between the two keyboards of the 1968 Lowrey Berkshire Deluxe TBO-1 organ. The output of the organ is fed into the audio input of the EMS VCS3 mk1 Synth. The first bit of processing to be applied to the organ sound is a low-frequency oscillator (LFO) controlling the frequency of a voltage-controlled filter (VCF), using a sine or triangle wave shape. In other words, the Synth is turning the tone of the organ from mellow to bright, up and down automatically.

Step 2 has the output of Step 1 being fed into a voltage-controlled amplifier triggered by a square wave LFO . This means the VCS3 is turning the volume of the organ on and off in a repeating fashion.

Source: http://www.wbtracks.co.uk/synths.htm

[The Real MC]

I got that exact same sound using my Vox Continental and a Vox wah pedal.

[pianotuner steveo]

Thanks coolkeys, but I am trying to simulate this sound with today's equipment.
I have a Gibson (Lowrey) organ, but need the right pedal.

RealMC: does this pedal do this automatically or do you have to keep moving the pedal up and down?

Believe it or not,
I have never used a wah wah in all my 50 years of playing!

[The Real MC]

Have to sweep the pedal manually.  I borrowed the Vox wah pedal from a guitar player, it was one of the early "McCoy" pedals and it sounded really good.  I would prefer a manual sweep for best replication of that effect.

I later got an old Morley wah pedal (large chrome case) and I never did try that on the Vox...

If I had to use today's equipment, can't think of a standalone box that could pull that off.  I would build from synth modules - VCF (multimode state variable filter would sound best), VCA, and two LFOs (one for VCF sweep, the other for square wave VCA tremolo).  Tons of modular options on analoguehaven.com

[Pianet Martin]

If I was trying to get close with pedals, I'd want a tremelo pedal with a square-wave LFO, and a wah (or ideally something like the moogerfooger LPF) swept manually. 

[AFeastOfFriends]

It is possible to roughly get the sound with a phaser, but I haven't heard a phaser that was as subtle as the filter on We Won't Get Fooled Again.

If I were to do it, I would use a square wave tremolo pedal (so you don't have to keep hitting the notes) and a standard wah because lfo-controlled filter pedals aren't a common deal and tend to be expensive, and are usually part of an volume-controlled autowah.