hi list,
info from dieter doepfer:
dieter says:
"Hi Bakis,

back from holidays and the workshop at the Music Shop
in Munic here is my
comment to the A-155 and A-107 discussion:

1. New A-155 control board
==========================

The A-155 control board (this is the small board with
the 4 buttons and 4 jack
sockets) has a 10 pin connector that is used to
control the analog boards
(potentiometers) and the gate/trigger board
(switches). The 10 pins of this
connector have the following functions:

A0, A1, A2 (adresses for 4051 multiplexer on
potentiometer and trigger boards)
Clock
+12V (2x)
GND (2x)
-12V (2x)

As some members assumed the basic concept of the A-155
uses the CD4024 binary
counter and the CD4051 analog multiplexers.

It would be possible to develop a new A-155 controller
board (A-154 ) that
includes additional features. The new controller
module would have to be
arranged near the A-155 at the right side and the 10
pin connector would have to
be removed from the "old" controller board and
connected to the new one.

Possible features would be:

Different running modes (forward, backward, random,
pendulum, one shot and so
on, similar to MAQ16/3, maybe voltage controlled
running mode )
voltage controlled addressing of the active step
control input for up/down (digital input)
or different clock inputs for up and down

We could use a PIC (as suggested of one of the
members) to include all the new
functions. The main questions are:

- is there sufficient demand for a new sequencer
control board
- how and which functions should be realized
- design of the user "interface" (i.e. how should be
distinguished between the
different running modes:

version 1: manual control of running mode (e.g. with
up/down buttons and LED
display)
version 2: voltage controlled selection of running
mode (manual control + CV
input with attenuator)
version 3: up/down control input and only one clock
input
version 4: two clock inputs for clock up and clock
down
version 5: ......

If we use a PIC with internal ADC it would also be
possible to include an
internal voltage controlled clock (e.g. altogether 3
CV inputs: one for running
mode selection, one for voltage controlled addressing
of sequencer step, one for
VC clock, each with manual and attenuated CV input).
Random clock would be
possible as well.

Many ideas, but which of these make sense and how
should they be realized (which
controls, inputs, display ....).

The problem is not to develop a new controller for the
A-155 but if there is
sufficient demand and which functions are necessary
and how should they be
controlled by the user.


2. A-107 "Morphilter"
=====================

And another comment regarding the A-107 (suggested new
name "morphilter" or
"morphfilter" "morfilter" or "more filter"):

We checked the avialability and prices of the required
parts to realize the
morphing feature at a reasonable price
(microcontroller, 4 ADCs, 4 VCAs, 4
voltage controlled slew limiters ...) and we will
probably realize this version
of the A-107:

Voltage controlled morphing will be possible within
each of the two filter
groups (remember: the two filter groups differ from
two capacitor values).
Probably these controls will be available:

Filter frequency (manual control and CV input with
attenuator)
Filter resonance (manual control and CV input with
attenuator)
Filter type (manual control and CV input with
attenuator)
Filter group (manual switch and digital CV input) ->
maybee not necessary (see
below)
Morphing time/Slew Limiter (manual control and CV
input with attenuator)
output VCA (manual control and CV input with
attenuator)
and maybee output panning (manual control and CV input
with attenuator) as the
CEM3379 includes a panning unit

Morphing within one of the two filter groups will be
smooth (no glitches/cracks)
and voltage controlled with voltage controlled
morphing time (i.e. "type CV"
determines the filter type and "morph CV" the time how
fast the new filter
appears). We think that this is a better solution than
to integrate the morphing
time into the filter type CV. Switching between filter
group one and two will
cause no glitch/crack too but a short mute (all
internal VCAs will mute during
the capacitor switching). Each filter group will
contain probably 16 different
filter types. We are not yet sure how many different
filter sequences will be
available (i.e. the order of filter types while the
filter type CV goes from 0
to +5V) and how the different filter sequences are
programmed by the user.
Probably a 3-digit display and some buttons will be
used to select the sequence
number and to program the filter sequences. The first
filter in the filter
sequence will determine if the sequence in question
uses filters from group 1 or
2 (e.g. the filters with number 1...16 are with
capacitor value 1 and the
filters with number 17...32 are with capacitor value
2). If the first filter of
the sequence is in the range 1...16 only filters of
this group can be added into
this sequence. This is only our first idea. Maybe
there is a better solution how
to program and select the filter sequences.

We hope to keep the price below 250.00 Euro/US$ with
all the features mentioned
above."

Best regards
Dieter Doepfer


THAT'S ALL...IF THESE NEWS AREN'T EXCELLENT I DON'T
KNOW WHAT IS...THE A107 SUPER FILTER WITH SO MANY
FEATURES FOR 250 EUROS.....
and a possible new a155 seq control board with many
new options for the a155 is,also,very desirable,i
think...
bakis.





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

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