--- Dieter Doepfer < hardware@... > wrote:

> From: "Dieter Doepfer" < hardware@... >
> To: "Bakis Sirros" < synth_freak_2000@... >
> Subject: SOU
> Date: Mon, 12 May 2003 16:42:54 +0200
>
> Dear Bakis,
>
> thank you for the last files concerning the SOU. I
> suppose the documents are
> copies from the Allen Strange book. We have this
> book in our internal
> library but never looked at the book in connection
> with the SOU development.
> So we already had the information we need in the
> company but did not realize
> that.
>
> Now we are about to start the first SOU developments
> and we have some
> question to the group members. The original Buchla
> SOU consists of several
> sub-units, that are completely independent except
> the power supply: analog
> noise generator, digital noise generator, smooth
> analog random voltage,
> quantized random voltages (2 power n / n+1
> distribution), stored random
> voltages, voltage controlled integrator, toggling
> S&H. Some of these units
> are already available as A-100 modules or could be
> realized with
> combinations of existing A-100 modules (e.g.
> analog/digital noise
> A-118/A-117, VC integrator A-171, S&H A-148) . Other
> features are not
> available in the A-100 so far, e.g. the quantized
> random voltages with 2
> power n and 2+1 distribution or the stored random
> voltages. This leads to
> several questions:
>
> Do the members of the group prefer one "big" module
> with about all features
> of the Buchla SOU or is it better to develop several
> modules with all the
> independent sub-units. From our point of view the
> second solution has
> several advantages:
>
> 1. The first SOU sub-modules would be available
> earlier as the development
> time for each sub-module is much shorter than for
> the whole unit.
> 2. Each customer could pick out the modules he
> really needs/prefers.
> 3. Some functions are already available (A-117,
> A-118, A-171, A-148) and
> need not to be payed if already available.
>
> But maybe some customers would prefer the complete
> SOU device as one big
> module.
>
> We would start with the functions that cannot be
> emulated with existing
> A-100 modules:
>
> - Quantized random voltages (2 power n / n+1 states)
> - Stored random voltages with distribution control
> - toggling S&H
> - fluctuation random voltages / noise triangle with
> probability of change
>
> For the first sub-module we would increase the
> n-range from 6 to 8 (max 256
> states at the 2 power n and max 8 states at the n+1
> output). We also think
> about some additional features like a "N"-output
> (quantized voltage that
> represents the value "n") or additional state
> outputs with adjustable
> weighing of the N added digital noise outputs
> (similar to the divider A-115
> but for control voltages).
> For the toggling S&H we think about a quantized/non
> quantized mode. The
> quantized mode would be useful for tonal
> (VCO)applications if desired.
> For the fluctuating random voltages we think about
> additional controls (e.g.
> frequency of the triangle) and outputs (e.g. noisy
> triangle output).
>
> Best wishes
> Dieter Doepfer
>

=====
synthfreak(parallel worlds)
athens-greece
1 group owner

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