Is there an effect that will make this crazy awesome sound?!?

[MikeH]

My friend just picked up an old organ with tons of sounds, etc, and while I was playing around with it I found an incredible sound.  I don't know exactly which  patches I was using, but I know one was the "WOW" patch a lot of organs have.  Basically, it sounded like a small stone with an envelope attack (so it always starts, or kind-of 'jumps' to the top of the sweep), starting with the speed way down and gradually turned up.  Like this:

Whaaaaaaaaaaaooooooooooooowww  Whaaaaoooooooow  whaaaaooow whaaooow whaaoow whaoow whaow whwb whwb whwb whwb... etc

Is there a guitar effect, DIY or not, that can do this?

[frequencycentral]

Sounds like a voltage controlled filter being controlled by a voltage controlled low frequency oscillator that is being controlled (sped up) by and envelope generator. If that helps. you could (heavily) modify a Maestro FSH to do this.

[The French connection]

Like this?

http://www.youtube.com/watch?v=dR62Jd45l8E&feature=related

The Maestro sample and hold can do this...

Dan

[Mark Hammer]

It's going to be tricky, because a keyboard defines where the start of the note/event is automatically, simply by pressing a key.  In the case of guitar, you'd not only need a circuit to produce the effect, but another circuit to reliably identify when a note/event started and you wanted that cycle of events to commence.

[MikeH]

Like this?

http://www.youtube.com/watch?v=dR62Jd45l8E&feature=related

The Maestro sample and hold can do this...

Dan

No, not quite.  It's really a rate thing.  The sweep starts really wide and speed up exponentially (literally- I think).  And it really sounds like a small stone on the 'more intense' setting.

[The French connection]

Like this?

http://www.youtube.com/watch?v=dR62Jd45l8E&feature=related

The Maestro sample and hold can do this...

Dan

No, not quite.  It's really a rate thing.  The sweep starts really wide and speed up exponentially (literally- I think).  And it really sounds like a small stone on the 'more intense' setting.

Ok! more like a rotary speaker or Lesley speaker rampin up and down!

Boss RT-20
http://www.youtube.com/watch?v=nbZkx030iHM&feature=related
http://www.youtube.com/watch?v=TjT7hN-zPQM&feature=related

Dan

[MikeH]

Yeah, kind of like that- but with an envelope controlled attack.

[SteveB]

I think part one would be the envelope generator, similar to a Slo Gear. But, it would not affect volume, it would affect the next part of the circuit. Or, maybe the sound you are describing would include a bit of volume ramp up with no attack.
The envelope would control the resistance on the speed control of the phase/flange/auto-wah or whatever.
The envelope threshhold & decay would determine the rate that the phasing speeds up.
Everytime you would play a note on guitar that would hit the threshold, the wah/volume/phase sequence would start over again.

Maybe that is what frequencycentral was talking about?

Maybe not easy, but possible?

[frequencycentral]

Maybe that is what frequencycentral was talking about?

Yeah:

Trigger detector  >  release generator (inverted, so the voltage increases over time)  >  VCLFO  control voltage input  >  VCF control voltage input.

Easy to do from a keyboard, much more difficult with guitar, as the problem would be at what point(s) the trigger detector kicks in. Probably hard to control and only effective for long notes and careful playing. Or you could dispense with the trigger detector and use a momentary footswitch to initiate the effect.  Possibly a little gimmicky - a once in a blue moon effect?