new effect?

[bored and old]

ok. i'm new here. i may never come here again.
i built something iv'e had churning in my brain for years...
the volume of the the 'played' guiter turns a motor that is attached the the potentiometer of an effect...(your choose of effect).. i used a wha wha effect.

    1 I built a 'smoky clone'... a simple little amp, using a LM 386. this amplifies the guitar, to drive the second 'smoky clone'.
    2 I built a second 'smoky clone' , except this one is modified to run a small motor. the louder you play, the faster the motor turns.
    3 this is connected to the effect pot of a wha, or other effect to create a auto trem/ wha/ whatever.
(note) i took the stopper off the potentiometor for continuios spin... the motor gets picked up by the potentiometor and creates a noisy sort of harmonic... i wanted to try it with a little ac motor, so it would jump around.
If someone thinks it is worth it, i will attemp to draw up a schematic of this.
thanks. jeff

[nelson]

This could be done with an envelope controlled LFO controlling a filter.

[twabelljr]

This could be done with an envelope controlled LFO controlling a filter.

Really? I imagine it would sound completely different. Where an LFO would respond up, then back down, then back up (1-2-3-4-5-4-3-2-1-2-3-4-5); a free spinning pot. would respond up, then up, then up (1-2-3-4-5-1-2-3-4-5-1-2-3-4-5). I still do not completely understand LFO's, but don't they always need some time to decay, whereas the pot would transition from full up to zero instantly if free-spinning?

[Transmogrifox]

You can make a ramp generator LFO.  I have had good success with this circuit:
http://www.geocities.com/transmogrifox/PWRingMod.JPG

The ramp generator is the part where I would like to draw attention.  There's a 15k resistor tailing to ground on the current mirror.  By being grounded, it's set at maximum oscillator rate, which is well into the audio range.  To make this the most useful as an LFO, you could tie that 15k resistor to the wiper of a 250k pot, "A" and "B" lugs connected to Vcc and ground respectively.  This would allow you to control the rate.  The rate is directly related to the amount of current through that current mirror.  I have had good success controlling the rate with a voltage (such as an envelope follower output).  The more current to the capacitor, the faster it goes. 

Instead of going to the pulse-width modulator, you could buffer the output and drive a voltage controlled resistance, or a VCA, VCF, or a VCR  (ok, so I just threw the VCR in there for giggles).  These various elements come in the form of and LDR, OTA, PWM choppers (like shown in this circuit), JFETs and some types of optoisolators.

The circuit shown in the link is a ramp tremolo (the LFO drives a VCA that is a pulse width modulated chopper).  It's really geared as a ring modulator, where the ramp LFO isn't strictly an LFO.  The rate ranges from 1 cycle ever 3 seconds to as high as 18kHz with a single pot.  Pretty incredible, really.  So it goes anywhere between very choppy tremolo (like if you wired up your motorized rotating pot as a volume control), to making sounds like bells and gongs and low-fi synthesizer sounds.

[birt]

could you make a soundclip?

[Connoisseur of Distortion]

very interesting way of going about it, bored and old. my only real uncertainty is that the potentiometer might go bad, as pots have a limited number of rotations...