[sdiy] Continuously variable waveshaping (was Behringer Neutron)

[Tom Wiltshire]

> On 11 Apr 2018, at 19:36, Dave <dlmanley at sonic.net> wrote:
> 
> Cynically, some companies compensate the employee for patent filings, and some employees like to boost their income. Other companies like to tout their patent collection or number of patents.
> 
> I'm not claiming any of those apply here. 
> 
> The main patentable concepts that Moog seems to be claiming are the use of preloaded control voltages and the sequencing of them to generate a waveform. While this seems somewhat novel to have within a VCO, I'd note that the same concepts are used in multistage looping envelope generators (AR, ADSR, AHDSR, etc). 
> 
> -Dave

...and a multistage looping envelope generator running at audio rates is? An oscillator!

I did some of this digitally for the Modcan AHDBDSR envelope some years ago. By patching a Frequency CV into the Envelope’s Time CV control and carefully tuning the Amount knob, it was possible to get it to play in tune up to around Middle C. I did baselines on it as a demo, and the shape mod gave timbre modulation, as you’d expect.

http://www.modcan.com/bmodules/ahdbdsr.html

Tom