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

> From: "Dieter Doepfer" < hardware@... >
> To: "bakis Sirros" < synth_freak_2000@... >
> Subject: AW: 1 Re: info about the super
> filter! from doepfer.
> Date: Thu, 17 Oct 2002 14:15:49 +0200
>
> > -----Urspr�ngliche Nachricht-----
> > Von: bakis Sirros
> [mailto: synth_freak_2000@... ]
> > Gesendet am: Donnerstag, 17. Oktober 2002 09:47
> > An: dieter doepfer
> > Betreff: Fwd: 1 Re: info about the
> super filter! from
> > doepfer.
> >
> >
> > --- ringmod45 < ringmod45@... > wrote:
> > > To: Doepfer_a100@yahoogroups.com
> > > From: "ringmod45" < ringmod45@... >
> > > Date: Thu, 17 Oct 2002 02:55:40 -0000
> > > Subject: 1 Re: info about the super
> > > filter! from doepfer.
> > >
> > > hi bakis,
> > >
> > > the Erwik filetr is based on the low cost Curtis
> 3372 combined
> > > VCF/VCA that is also found in the budget
> Sequential Prophet-600,Akai
> > > AX80 and the absolutely superb Oberheim Matrix
> 12.
> > > to the best of my knowledge, there were only 15
> possible variations.
> > >
> > > 1 pole Low
> > > 2 pole Low
> > > 3 pole Low
> > > 4 pole Low
> > > 1 pole High
> > > 2 pole High
> > > 3 pole High
> > > 2 pole Band
> > > 4 pole Band
> > > 2 pole Notch
> > > 3 pole Phase
> > > 2 pole High + 1 pole Low
> > > 3 pole High + 1 pole Low
> > > 2 pole Notch + 1 pole Low
> > > 3 pole Phase + 1 pole Low
> > >
> > > do you mean to say that Doepfer will add more
> then the ones mentioned above.
>
> Yes, definitely. The frequency response curves on
> the provisional A-107 page
> show already many filter types that were not
> available for the ERWIK or
> Matrix12/Xpander filter.
>
> > > the filter will require at least a 2 digit
> display like the A113
> > > subharmonic generator. the first digit could the
> filter type and the
> > > second digit would be the memory position for
> the filter type from
> > > the vc filter selection input. on the outer
> edges the display, you
> > > could have the dual pushbuttons like the A113 to
> go up or down. now
> > > you are probably wondering , how would get
> fifteen locations out of a
> > > simple single digit display. you use the digits
> 1 to 9 for the one to
> > > nine positions, you use the 0 for the number ten
> position, then you
> > > add a dot at the bottom left position of the
> digit for the digits
> > > over ten, i.e .1 is for eleven, .2 is for twelve
> etc. etc. same goes
> > > for the memory position for the vc filter select
> input position.
> > >
> > > to program the sequence of filter types for the
> vc filter selection
> > > input you press the 2 vc filter selection input
> push buttons at
> > > once , then the vc filter selection display
> starts flashing at the
> > > number one position. you then press the up or
> button on the left side
> > > for ther filter type value. to set the second vc
> filter select memory
> > > value you hit the down button to set it the 2
> position then you hit
> > > the up or down on the left side for the filter
> type. you keep
> > > repeating the steps to complete the sequence of
> the filter types.
> > > once you are done programming, you push the two
> vc filter selection
> > > input buttons at once and the flashing memory
> positon stops flashing
> > > and away you go.
> > >
> > > there is an example of what i mean for the
> display the files section.
> > > hope this helps on the logic side of the vc
> filter selection input.
>
> Thank you for this suggestion how to select a filter
> and how to define the
> filter sequence. We even think about different
> filter sequences that available
> in the module as it is very long-winded to define a
> new filter sequence (but
> somewhere we have to stop otherwise we will have the
> same problem as for the
> touch sensor keyboard: too many different
> suggestions that increase the price
> and postpone the delivery date month by month).
>
> We will probably use a 3-digit display so that not
> only number but even filter
> abbreviations (e.g. "3h" for 3-pole high pass, "2b"
> for 2-pole band pass, "4L"
> for 4-pole low pass or "hnL" for high pass/notch/low
> pass combination) could be
> used. But maybe it is a problem to find a useful
> abbreviation for more complex
> filters (like the "tooth" filter on the A-107 page).
>
> Best wishes
> Dieter Doepfer
> Doepfer Musikelektronik GmbH
> http://www.doepfer.de
> email: hardware@...
>

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

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