Doepfer

--- Dieter Doepfer <hardware@doepfer.de> wrote:
> From: "Dieter Doepfer" <hardware@doepfer.de>
> To: "Bakis Sirros" <synth_freak_2000@yahoo.com>
> CC: "Roland Mayer" <technik@doepfer.de>,
> 	"Chris Assall" <software@doepfer.de>
> Subject: Comments
> Date: Wed, 7 Jan 2004 15:21:42 +0100
> 
> Dear Bakis,
> 
> please forward....
> 
>
> 
> 
> 
> Back from the holidays I want to give my view on
> some of the messages during
> the last few days:
> 
> A-149-1
> 
> We checked and discussed the A-149-1. Peter is right
> in two items:
> 1. The A-149-1 triggers at the falling edge of the
> clock signal but not to
> the rising edge as stated in manual. Normally this
> is no problem but we will
> correct this.
> 2. Chris confirmed that internally only one shift
> register is used for both
> parts of the module as he found no significant
> difference when using two
> separate shift registers (the shift register is
> triggered whenever a trigger
> from the upper or lower section of the module occurs
> but the corresponding
> random output is updated only by its trigger). Chris
> told me that it would
> be no problem to introduce two separate shift
> registers for both parts of
> the module if desired.
> 
> But we cannot confirm that the A-149-1 triggers on
> both the falling and
> rising edge of the clock.
> 
> 
> Sequence of module production
> 
> I think it does not make sense to postpone the
> production of module to a
> later date if the development is already finished to
> 90%. Only for modules
> that are planned (but the development has not yet
> started) it makes sense to
> rearrange the priority.
> 
> The development of these modules is ready or more
> than 90%: A-137 Wave
> Multiplier, A-154 Sequencer Controller, A-149-2
> Digital Random Voltages,
> A-197 Analog Meter, A-101-3 Modular Vactrol Phaser.
> These modules are
> planned for the next production series. Our
> manufacturer will get the
> production data about middle od January and I hope
> the modules will be
> available end of February (not binding).
> 
> For some other module we already have started the
> development and built the
> first prototypes. But it may be necessary to add
> some major modifications:
> A-101-1 Vactrol Steiner Filter, A-101-2 Lowpass
> Gate, A-152 Voltage
> Addressed Switch, A-164 Manual Gate.
> 
> Some modules are still in the early development
> state (no prototypes built
> but schematics and/or pc board under
> construction/discussion): A-1xx 12 Bit
> Clocked Delay, A-1xx Bit Cruncher (with voltage
> control bit number 1...12
> and voltage controlled sample rate >20kHz... a few
> Hz)
> 
> For the remaining SOU sub-modules A-149-3 (Toggling
> S&H) and A-149-4
> (Fluctuating Random Voltages) we are not sure if we
> will develop these
> modules. But it seems that the A-149-x series is
> more successful than we
> assumed. For the A-149-3 we think about a more
> general approach that is not
> limited to 2 toggling S&H only (e.g. 4 or maybe even
> 8 S&H with CV
> limitation to a certain number of S&H). The A-149-4
> could be another random
> CV that uses a noisy triangle - as Peter already
> mentioned - as basic
> source. The basic source is processed by two
> indentical units. Each unit
> contains a S&H and a vactrol low pass filter with
> very low sub-audio
> frequencies. The frequency of the filter and the
> rate of the S&H are
> controlled by the same voltage in the original
> Buchla design. We think about
> the possibility to control these two parameters
> independently by 2 voltages
> with normalized sockets so that it is possible to
> control both parameters by
> one voltage as well.
> 
> 
> Best wishes
> Dieter Doepfer
> 
> 


=====
Bakis Siros
Parallel Worlds / Polariton
Athens-Greece
[Doepfer_a100] group owner
http://www.rubber.gr
http://www.ward12.com

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