holding it in two seperate hands? thats a big resistor, i think possibly between the 100k - 1meg range. i think last time i checked (dont worry it was by accident, i dont measure my resistance daily or anything...) i got about 0.3 meg whick is about 300k... although now i think about it i may be off by a factor of 10, so it could be 3meg. either way, its quite big.

do you want one axis to be amount of feedback, and the other as some sort of filter?

go to this page:

viewtopic.php?t=569

see the line level output? if you take away the two resistors and the cap of that circuit it can output straight into a speaker, so i think that if you take that same configuration of the resistors and the cap, then it may just work in reverse...

perhaps it was a wiring error, could it have been because the speaker was wired to the output and +9, rather than output and ground? that was the only major mistake that im aware i made... there was some noise coming out of it, but only when it got really hot  

anyway, order some more chips and the proper components and i'll give it another go, and if it works its going in something ludicrisly extravegant.

spelling is haaard.

cheers mateys!

im probably way off the mark here, but i think some sort of diode trickery is in order... perhaps you could just mess around sticking a diode in places (such as on the supply or ground lines of each effect), or you could wait for somebody to tell you im wrong and how it should be done

tried to build this today but didnt have any of the right resistors/caps, and as such i think i managed to fry not one but two 556s!

from people that have made this, is the chip supposed to run at a high temperature? it maye have been because i fried them but they were getting hottt

ADC--fiddle,fiddle--DAC

This is the foundation of the science of Digital Signal Processing.  What you want to do is not monkey around by grounding the individual bits because that can only make distortion units and not very good ones.

  The trick is to take every incoming ADC number and multiply it by a very specific number.  Then do the same with the previous sample that was received, and the previous one, for about 10 or 20 previous samples.  Then the resulting calculations added together and then the result is output to a DAC.

 For example:

              new 16-bit sample:   29478   gets multiplied by .00387492
        previous 16-bit sample:  30987    gets multiplied by .00872880
        previous  "              "  :    28929   "     "            "     .07837877

          etc etc  etc                -----------------------------------------------
           
The results from all the multiplications are added and the final answer
gets sent to the DAC.   The list of multipliers (the number .00387492, and the others on that list) is unchanging and determines the filtered output sound.  Different sets of multipliers give different sound outputs.  This is the standard technique for simple audio filtering like a tone control or wah-wah pedal.

  The ICs that specialize in doing this are basically ordinary microprocessors that have one or two special instructions added that are not found in ordinary microprocessors.  This is the 'Multiply And Add' instruction that can do this specific combo of math very quickly.  They are called DSP processors (digital signal processing) and the usually cost only a little more than normal microprocessors.

  If you find this interesting so far I strongly encourage you to read more about the topic.  It does however get very dense very quickly.  But it can be worth the trouble.  DSP designers and programmers make a LOT of money, even if they are very young and/or don't have college degrees.
Few engineers can handle the math required and few math people care about the programming or electronics.

any chance of some more info? on here or via email/personal message would be good. im just going into the final year of my degree and im just getting into circuit bending/synths etc, so it sounds quite interesting. the prospect of lots of money is also quite interesting - but from where? what sort of employment?

cheers

i could be wrong, but...

http://www.musicfromouterspace.com/anal ... 0_PG1.html

i was looking at that today and im relatively sure that it contains an envelope circuit... keep clicking the next page button until you find it.

hope it helps

excited about building this... but are there any soundclips of what the WSG sounds like?

Hiya! only just found this place but I thought I'd put a message on here as I just modded my VL tone to give it pitch bend stuff!

Its really simple, all i did was take three wires from the pot you see on the PCB when you open it up, drill 3 holes in the front, and poke them through. I put them in a nice triangle, so any/all of them can be touched at the same time, and that means that i can get both pitch up and down effects, which is quite nice. If anyone is interested il try to get a picture/sound up at some point...

What I'm here to ask is how can i get a drum synth which has the same drum sounds as the vl tone? these arent even drum sounds, the snare sounds like white noise, and the bass and hat (or i think thats what its trying to be) are just tones. the drums can only be played in the patterns already on the keyboard though (just push a button and a rhythm starts, theres 7 or 8 different rhythms), and what im after is a way to play the sounds manually, something like 3 switches coming out so i can tap away merrily...

So, does anybody know much about doing this? im not sure if i would prefer doing it one my current vltone or buying a new one (only about £15 on ebay) to turn into a dedicated beat monster... any suggestions?

cheers