Hello,

the A-110-6 design has been finished already and the module is already in
production. I hope it will be available about April 2017. Maybe it's
possible to realize the VC phase shifting as an additional module.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto: Doepfer_a100@yahoogroups.com ]
> Gesendet: Dienstag, 14. Februar 2017 21:26
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 A-110-6 Voltage Controlled Phase Shift
>
>
>
>
> Dear Dieter,
>
>
> I know that the production design of the A-110-6 quadrature
> trapezoid VCO has probably been finalised, but hopefully this is
> something you would consider implementing I was reading J.
> Donald Tillman's article on quadrature trapezoid VCO design:
> http://www.till.com/articles/QuadTrapVCO/discussion.html
>
>
>
> And discovered that it is possible to voltage control the phase
> shift Would this be possible on the A-110-6 In my opinion it
> could become one of the most powerful features of this VCO.
>
>
> Voltage Controlled Phase Shift
> The quadrature trapezoid core also enables the implementation of
> voltage controlled phase shift over a multiple cycle range. I'll
> cover the details of this in a later article.
> While the Yamaha DX7 synthesizer is well known for its use of FM
> Synthesis, it really works with phase modulation. (The phrase FM
> Synthesis is used as a generic term to describe both frequency
> and phase modulation.) So analog versions of many DX-7
> algorithms are good applications for voltage controlled phase shift.
>
>
>
>
> Audio rate phase modulation can produce some amazing glassy
> FM-like sounds without pitch drift. In eurorack Malekko Richter
> Oscillator II and Schippmann CS-8 Omega-Phi have phase modulation
> capabilities but since adopting a 100% Doepfer A-100 system I
> feel we are missing out on these sounds. At LFO rate we can
> achieve chorus / supersaw like sounds.
>
>
> It is possible to approximate similar sounds via Lin FM on
> A-110-4, but the pitch drift makes it less suitable for pitch
> perfect musical applications. Here is an older demo of mine
> exploring audio rate phase modulation feature on the Richter
> Oscillator II:
> https://soundcloud.com/sfx-lab/malekko-richter-oscillator-ii-phase
> -modulation-demo
>
>
>
> Is this something you have considered or would consider
> implementing on the A-110-6 or as a follow up model
>
>
> Thank you very much! Really looking forward to exploring your new designs.
>
>
> Best wishes,
> Vytis Puronas
>
>
>
>