Per, thanks for the links. When I look at the first schematic and try to implement it I end up with the pach 'buchla source of uncertainty.pch' (attached). For testing I added an output module so the noisyness of the 100 Hz oscillator can be heard. With knob 3 (1st knob on the module '(noise/100hz)') the amount of linear noise modulation can be changed. Maybe the noise speed should be changed as well, when it must be faster (more hissy) some extra modules are needed, when it must be slower (more jumpy) the speed can be controlled with the knob on the module labeled 'noisy'. The output module can be removed once the desired level and quality of noisyness have been established. The +35 setting for the module '100 Hz' together with the setting to 126 for the 2nd knob on the module '(noise/100 hz)' sets the speed of the Triangle oscillator to approximately 100 Hz (quickly tuned by ear trying to remember what 50 Hz (euro hum) sounds like, so please retune as needed). I left out all of the extras you put in to keep things as clear as possible. I did add however linear and exponential control for the Low Frequency Oscillator as well as a correlation modulation input (those were not in the schema) Interesting little circuit, I'll try to make some noodles with it now. Jan. Per Wikström wrote: > Thanks, Jan. I picked it up on > > http://www.musicsynthesizer.com/WoggleBug/WoggleBug.html > > A picture of the module, with the noise outputs I exkluded, is on > > http://www.musicsynthesizer.com/Buchla/source_of_uncertainty.htm > > It also contains the original handwritten schematics for the hardcore > analogue-fan. More of it, with schematics for other modules, can be found on > > http://members.chello.at/anubics/html/Buchla.htm > > But some electronic knowledge is needed to use them for emualtions, more > knowledge than I have, at least. > As I remember that small buchla system, it contained no PWM-osc, and no > sequenser. Don´t remember if it even had a VCF. The main soundwork was done > with ringmodulator and AM. So I tried to use the same method to get a > vintage feeling. But I miss that 1 sqmeter goldplate reverb with motorized > damping that made all patches sound as part of steel mill... > > Per > > > ----- Original Message ----- > From: "Jan Punter" > To: "Nord Modular" > Sent: Saturday, February 14, 2004 3:07 PM > Subject: Re: [NM] Buchla-emulation > > > >>Nice work Per, lovely noodle. >> >>AFAIK, the Buchla is a linear system, and so probably LFO modulation >>would have to be done through a gray input (with some appropriate >>scaling applied, probably). >> >>Do you have an URL for the block diagram ? >> >>Jan. >> >> >>Per Wikström wrote: >> >> >>>Mail on this list led me to an old Buchla-module with a beatiuful name, >>>Source of Uncertainty. I used it IRL many years ago, in a Buchla system >>>without any keyboard. On that machine, the module was the major CV >>>source. Sorry to say, that system is no longer in use, but can be seen >>>in The Stockholm Music Museum. >>>I found a block diagram of Source of Uncertainty on the net. Here is an >>>emulation of it (with no sound modules) and a little noodle based on the >>>Source of Uncertainty. >>>I found no good way to modulate the triangel LFO with noise, as it done >>>in the original module, so I put in an X-mod. On the other hand, it´s >>>possible to mix between random an arpeggio-like CV, and control the mix >>>with other CV. >>>Per >> >> >>_______________________________________________ >>Nord-Modular mailing list >>Nord-Modular@code404.com >>http://code404.com/mailman/listinfo/nord-modular >>_______________________________________________ >>Patches sent to the Nord-Modular mailing list >>may not be redistributed without the express >>consent of the author/creator. > > > _______________________________________________ > Nord-Modular mailing list > Nord-Modular@code404.com > http://code404.com/mailman/listinfo/nord-modular > _______________________________________________ > Patches sent to the Nord-Modular mailing list > may not be redistributed without the express > consent of the author/creator. >