Hi Bakis,

here is my technical comment concerning two or more
A-155 controlled by an
A-154:

It is not possible to connect the CV outputs of two
A-155: It is generally not
"allowed" to connect two outputs. As there are short
circuit protected circuits
or protection resistors in the outputs of all A-100
modules you cannot destroy
anything within the A-100 by connecting two outputs
but the outputs will no
longer work as they should (this is valid generally
for outputs and not only for
the A-100, e.g. try to connect the outputs of two
amplifiers - or better do
not).

So you need a circuit (e.g. the VC switch A-150) to
switch between the CV output
of the first A-155 (step 1...8 of the sequence with 16
steps) and the CV output
of the second A-155 (step 9...16 of the sequence with
16 steps). Same is valid
for gates and triggers. The final A-154 will probably
generate a control signal
(internal address signal A4, probably a socket at the
front panel labelled
"1...8/9...16") that is used to control an A-150 that
switches between the
outputs of the two A-155 controlled by the A-154.

Details for technicians: of course the signal A4 and
the inverted A4 could be
used also to control the inhibit inputs of the 4051
multiplexers on the two
A-155 and to connect the outputs of the two 4051. But
this leads to another
problem that requires an electronic switch too: both
A-155 are equipped with the
output circuits that buffer the voltage coming from
the 4051 outputs. If the
A-155 are used separately (2 x 8 steps in parallel)
each 4051 needs this output
electronics separately. If the two A-155 are used as a
16 step sequencer the
outputs of the 4051 have to be connected and fed into
only one output circuits.
This required electronic switches too. So the solution
with the A-150 has no
disadvantages and no modification of the A-155 is
necessary.

I hope this helps for the further discussion (as it
does not make sense to
discuss about things which are not possible from the
technical point of view).

I don't think that an envelope generator should be
integrated into the A-154.
For this 3 envelope generators are available already:
A-140, A-141, A-142. Other
customers may ask why not integrate a VCO, and VCF and
a VCA and ... Of course
I'm aware that there are different opinions if
functions that are already
available in other modules should be integrated into a
new module. E.g. our new
A-109 VC signal processor contains a VCF, VCA and
panning unit. And A-100
customers could mention that these modules are already
available as A-122, A-131
and A-134. For the A-109 the price was the reason as
it will be much cheaper
than A-122+A-131+A-134.

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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