Foogers! I live them!!
I recenty bought a low pass filter but now I also have a ring modulartor and a feq box. I did not even like the freqbox at first but now I understand what hard sync is and what the outs are for this thing and I like it!
Now I can really experiment with control voltages.
You’ll need a CP-251 next! I highly recommend it! 
Either that or the MP-201 would be a good way to go.
I have 2 CP-251 & a MP-201 you really need both because then you will have all the wave forms available to you. I now have a second Low Pass filter and having that second one has added another depth to my audio creation.
It begins. I didn’t like the Freq either when I first bought it now I love it.
Valuable resource.
Eric
I have a love/hate feeling about my Freqbox!
Well, I did end up getting the CP-251. I just ordered one today.
Eventually I would like to get the digital delay but by financial situation is a bit bruised already with the other foogers I bought. Anyway, its good for the economy.
I will eventually buy a modular system but I figure this is a hold over and gives me some ideas on what I can do with one. My interest in analogue gear is more from the processing side anyway. I have a Korg M3 which can provide some great audio material ready for mangling.
I may also at some point in time get a MIDI to CV box.
The reason why I was first turned off by the Freqbox is that I despise any device that tries to convert pitch to MIDI (i.e. MIDI guitar synthesizers). The only ones I do like are things like the EM POG that don’t try to make a guitar into something its not but allow its natural dynamics to be used but in a new way.
But the Freqbox does something insteresting and that is hard sync. This is not, as someone pointed out to me here on this board, pitch to MIDI or any kind of conversion of a signal to pitch. It is allowing the natural dymanics of hard sync to create a waveform with a strong frequency component based on the modulating signal. I see many applications for this far beyond guitar.
I am also very impressed by the ability to modulate the shape of the waveform of the carrier oscillator. This is something you find in many of the advanced modular synthesizer modules.
Most of what I see, almost all of what I see, on demo videos of this product show people using it as little ore than a noise maker. I believe its capable of much more than that. I hope to create some sounds with it that will not be like the run of the mill applications I have seen. By using the CP-251 I want to create drones and by using envelope followers CVs, and perhaps the lag processor, and perhaps even the vactrols I ordered to control the envelopes, I hope to create complex timbres.
I want to take foogers into the realm of experimental music. I know that Moog has long been on the cutting edge of pop but now its time to take it further back to the roots of electronic music.
Awesome!
Yeah! 
Complex timbers!
I love to do that to may guitar sound.
Last time I was playing with great free jazz band and
guys were blown away…after show they asked me:what
was that? I said: BOB MOOG!
They didnt know the name,they just said:Yeah BeBob is cool! LOL
Complex timbers:
Complex timbres:
Hmm, my post did not appear to be added here…
That a lot of wood. Wood has a really interesting tmbre especially depending on how you shape it. If it surrounds a nice hollow space great things can happen although I don’t think additive synthesis would be the best of models.
I agree. Particularly what I find very interesting are the experiments with wood done by Les Paul in the 1930s and 1940s. I find the tones produced by mahogany and flame maple in particular to be very pleasing. 
Ahh…the timbre of timber. 
What is Vactrol?
Indeed what is a vactrol!
Simple two things:
Both pointed at one another.
I just got three of them from Allied Electronics today.
Here is what they look like and they are cheap:
Another name for them is a optoisolator because they can be used to isolate two circults.
They work like a relay. Switch on a simple circult to supply power to the diode and the LED lights up. Before this, the photocell is in darkness and therefore, it’s resitance is high. Once the power is applied, the LED causes the resistance fo the photocell to drop to a very low resistance, almost an open circut.
So why is this musical? Here is the magic! Vactrols sing! They sing there little electronic hearts out.
You don’t believe me listen:
You use them with what is called a low pass gate:
Plan B has them along with other modular companies:
http://www.ear-group.net/model_13.html
Secret - these little beasts create a envelope that when combined with filter produce pseudo natural sounds like plucked strings. I think this is one of the things that attracted Morton Subotnick to Buchla systems. I am not sure why Moog never used them. But you can buy them and you can plug them into a fooger (if you are handy with a soldering iron), 1/4 " plug, cable and a bit of folder will do it.
Combine it with a MIDI to gate (relay), and a low pass fooger and you have a vactrolfooger singing like the best of them.
Sounds cool to me Is this something like vintage tremolos used?
Am…or univibe?
So where do you plug them? Cutoff in? Or you open your fooger and do some
science there? Can you make some explanation,Im really interested! 
There is much that can be done with simple photocells that would do some of the things that you are asking about. Vactrols are enclosed and have 4 leads, two for the diode and two for the photocell. There effectiveness is based on their response.
You could also use a vactrol for a simple tremolo with the control processor or an LFO from a modular. Simple hook up the LED end to the LFO. You can get cable and 1/4" plugs at Radio Shack or other electronic Herestores on line. Then connect the vactrol LED leads of the vactrol to this. This will cause the LED to pulsate like it does not the Freqbox. You can see this with a vactrol but if you want a visual you can simply buy LEDs (you can get these at Radio Shack too). Then, I believe you may be able to use the mixer of the control processor or some sort of VCA module along with the photo cell either as resistor or combined with voltage sounce, a CV source.
As for the legendary univibe, these did not use vactrol in the sense of single vactrols with four leads but LEDs and photocells.
Here is a good web site:
http://www.lynx.net/~jc/pedalsUnivibe.html
Photocells are very underated musically. For example, you want a cheap therimin (frequency wise). Send an LPF fooger into self oscillation and then plug a photocell (DIY device with plug and photocell) into the frequency. I have done with and with a good flashlight pointing at the cell and you hand in between, you have a cheap therimin.
What should you control? That what I love about foogers. Its up to you. If you use cutoff on an LPF you get a Morley wah (for those technically astute here, yes I know, wahs are bandpass) but something like it. All Morley pedals do is use a photocell to control the frequency of a band pass. The pedal simply translates the movement of the pedal into verticle motion (with gears) to move a cover for the photocell up and down.
If that interests you, consider this. Photo cells come in all sorts of shapes and sizes. Infared, UV, ect. I will let you mind run with that one.
Consider polarized sheets. Create two wheels moving in oppositive directions. A photocell behind them and isolated from light except for the light coming through the filters. You get something that simulates the acceleration and deceleration of Leslie speakers.
By the way, you don’t ever need to open and circut bend you foogers to do this. Just some audio cable, solder, 1/4 plugs and creativity. Sort of what Robert Moog used when he created his wonderful instruments.
Thanx for all this info!
I will study this,just to get some time.
It is great to just plug something in something and magic can happen!
Do you use any contact microphones for experimentation?
One thing I was doing allot was that I had an old dictaphone and I made
tape cassetes with 5 sec tape loop inside,so you could record something and than play it back into guitar pickup and it was much more interesting than if you would plug it into mixer. So I was able to record my drummers loop and send it into my guitar pickup and all the foogers and effects to loop station.
If you don’t want to build your own “photo CV” controller, someone else has done it for you:
http://www.analoguehaven.com/devieverusa/peep
Lux: I appreciate your desire to experiment, and I think you’d really be into the BugBrand stuff.
Take a look: http://www.analoguehaven.com/bugbrand/boardweevil/