Warped vinyl pitch modulation?

[mr.adambeck]

Hey all, I'm interested in getting a subtle pitch modulation, similar to the sound of a warped record.  Like a slow, shallow sine wave modulating the pitch.  Does anyone know of any circuits that could do this or have any ideas of ways I could tweak something to get this effect?

Thanks!

[Strategy]

Oh yeah. The Clari(not) Cubed would be a good one for you. Using a PT2399 its sort of superficially would appear to be a chorus pedal but actually to me its sort of more of a pitch warble/melt/warp machine. Wonderful stuff, from drippy vibrato to real wooze. Search the forum for the threads on it there are some sound files. As Rick Holt has just generated a PCB layout I intend to build this one very very soon.

With a ramp LFO instead of triangle you could likely get the assymetrical-but-repeating warble typical of warped records.

Its not a DIY item but SnazzyFX (forum member Dan Snazelle) is issuing a pedal called "Wow & Flutter" intended to emulate the pitch warble of damaged/aged tape. Similar to vinyl warp.

- Strategy

[brett]

33rpm = 0.55 Hz
The classic warp is the "bowed" record, with 2 x bends per rotation = 1.1 Hz.
The frequency of a heartbeat - coincidence?

[mr.adambeck]

Thanks for the suggestions!  I dunno, the clarinot seems a bit more than I'm looking for.  I really just want a subtle sine wave pitch detuning, at 100% wet.  hmmmm.....

[armdnrdy]

You can add an LFO to an existing delay pedal without too much work to get that effect.

A small daughter board and two controls, Depth and Speed.

[Mark Hammer]

As with many perceptual phenomena, the slower the change, the more pronounced the change has to be in order to be noticeable.  Although simply lifting the clean signal in a phaser, and using only phase-shifted signal, will produce discernible vibrato, you have to crank the rate to hear it.  Same goes for using only the delay signal in a chorus or flanger.  The pitch wobble is certainly quite audible in all 3 of those, but if the sweep rate is slow, the sweep width has to be up, and the amount of pitch change created has to be appreciable.

I mention this to note that if you want to mimic something that doesn't happen terribly fast, you'll need to plan around having "enough" modulation.

[Strategy]

I just built an older Madbean version of the Boss CE-2 ("pork barrel" by Madbean)

It integrates many of the published mods including one that kills the dry signal so you get just vibrato. It has some high cut and gives a very musical warble. Quite like a record player with warped record, or even more so, it's very much like a tape deck running low on battery. I used it on Rhodes piano at a recent band practice, sounded amazing like I was instantly giving a sad vibrato rhodes vibe right off an old tape. Very vintage sounding

It was a complex build just for a chorus but this dry-kill switching element really makes it extra nice!

May make a nice option if you want just "mild" warble

[merlinb]

Jenny Greenteeth?

http://circuitworkshop.com/forum/index.php?topic=1136.msg8939#msg8939

[moosapotamus]

Similar to the pork barrel, I built and heavily modified a small clone chorus a number of years ago (wavy gravy, on my website). The sound clips I made were all prety extreme, but it certainly has the capability to get quite subtle sounds as well. So, maybe another option would be to pick up a used eh small clone on ebay for relatively cheap, and just mod it. I think you would want to be able to kill the dry signal and also add a few different timing cap values to be able to get differend degrees of warble. That would be a lot easier than building most any other chorus pedal from scratch.

~ Charlie

[bwanasonic]

I used to get a similar effect with my Ibanez 505 chorus by sticking a dummy plug in one out to get a 100% wet signal. I think it was more of a square wave, but it was sufficiently seasick inducing.