It will be a problem to re-built the 4012 ARP filter as many of the parts
used in this filter (similar to the Moog transistor ladder but with special
dual FETs and dual transistors that are no longer available). One could use
other dual FETs and dual transistors (or even single FETs and transistors)
but it would not be the same.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von Michael O.
> Gesendet: Montag, 8. Mai 2006 23:50
> An: Doepfer_a100@yahoogroups.com
> Betreff: SV: 1 Arp module suggestion
>
>
> I wouldn't mind a filter like the 4012.. I got an ARP2600 with that
> filter, and that's awesome! I have no other filter that's near that
> one.. (And I have a few options to choose from)
>
> /Michael
>
> --- Anton Coops < dubshot@... > skrev:
>
>
> ---------------------------------
> Hi Bakis,
>
> You're right, this is very important, I was referring to the 'classic'
> Arp
> filter that was used in the later Odysseys and the Axxe from 1975 or
> so, and probably it should be *without* the design flaw that
> originally cut off frequencies above 11 kHz.
>
> Greetings
>
> Anton
>
> On 8 May 2006, at 10:42, Bakis Sirros wrote:
>
> > hello anton,
> > i'll wait for your detailed explanation regarding your
> > future module suggestions before i make polls about
> > them.
> > regarding the ARP filter module: which ARP filter
> > should this module be modeled around
> > regards,
> > Bakis.
> >
> >
> >
> >
> > --- Anton Coops < dubshot@... > wrote:
> >
> > > > > > quality is very high, but more than 500 $ is
> > > quite expensive.
> > > > > and by the way: I saw, that the cwejman EQ does
> > > not continuously add
> > > > or
> > > > > subtract the corresponding band asyou would
> > > expect it from a mixing
> > > > > console's EQ. You have to switch between add or
> > > subtract. So it is
> > > > > assumingly nothing else than a A127 plus
> > > inverters for the original
> > > > mix
> > > > > (incl. the switches 5 Euro of material).
> > > > >
> > > > > It should be a very simple addon package (one
> > > TL064, eight resistors,
> > > > > three switches) which would modify the A127.
> > > > >
> > > > > Florian
> > > > >
> > > >
> > > >
> > > > well, yes, and i guess you also need some vca's
> > > for
> > > > voltage-control of bandwidth and level per filter.
> > > >
> > >
> > > Hello Florian, Ingo,
> > >
> > > Sounds like a good idea for an a-127 expansion
> > > module to me!
> > >
> > > I agree with Ingo that the ideas that are not yet
> > > finished should not
> > > be forgotten, but at the same time it';s fun to
> > > think of new modules,
> > > so I actually have several ideas (sorry :)
> > >
> > > 1. A second A-108, but this time arp-style
> > > 2. Equal Temperament Quantizer that does different
> > > ET's
> > > 3. Timbral Quantizer that can derive (dynamic, real
> > > time) scales
> > > from timbres from vco-type modules, like a custom
> > > made sinus
> > > bank, fm-operator, or a custom ring modulator.
> > > 4. (See 3.) Some oscillators or sound sources that
> > > would be
> > > specially built to work togethjer with the timbral
> > > quantizer, so you
> > > don't need to do Fourier analysis to derive a scale
> > > from a timbre, but
> > > you can derive the spectral information you need
> > > from the settings
> > > of the sound source using some (digital)
> > > mathematics.
> > > 5. expansion-module for both quantisers (maybe even
> > > for the a-156)
> > > for creating custom scales and arpeggio's
> > >
> > > I'll write down more about idea's 2-5 as soon as
> > > possible
> > >
> > > Greetings
> > >
> > > Anton
> > >
> >
> >
> > Bakis Sirros - Parallel Worlds
> > 1 group owner
> > http://www.parallel-worlds-music.com
> > http://www.myspace.com/parallelworldsmusic
> > http://www.shimarecords.co.uk
> > http://www.rubber.gr
> > Athens-Greece
> >
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