Doepfer

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@doepfer.de





=====
synthfreak(parallel worlds)
athens-greece
[Doepfer_a100] group owner-moderator

__________________________________________________
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> I don't think that an envelope generator should be
> integrated into the A-154.

Hi Mr.Doepfer, since the A154 on its own will generate a variable 
pulse width from the clock. you could use the pulse duty cycle to 
determine the length of the envelope. you would only have to add an 
extra jack output. most of the time, people are using their A155's 
between 80 BPM to 160 BPM, since most of the sounds will be of the 
short and percussive type, you could put a simple decay envelope to 
free up the other EG's in your system. this would be a bonus 
situation. there are plenty of uses to warrant it being there. 

if a poll was created to see if people would be interested and people 
liked the function, would you consider this option?

thanks for all the info and discussion for the proposed A154.

Regards,
RM

> 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@d...
> 
> 
> 
> 
> 
> =====
> synthfreak(parallel worlds)
> athens-greece
> [Doepfer_a100] group owner-moderator
> 
> __________________________________________________
> Do you Yahoo!?
> U2 on LAUNCH - Exclusive greatest hits videos
> http://launch.yahoo.com/u2

Question:  Will the A154 also include a Phlogiston Inducer?

I'd REALLY like to know whether to wait for Doepfer to supply such a 
feature on the A154 (which, for the way I work, is essential to my 
creativity), or just go out and purchase another "off the shelf" 
CIGARETTE LIGHTER.

C'mon guys.  I know we're all trying to get as many features (as well 
as cost-effectiveness) out of the A154 as possible, but I'm left with 
a few questions.

Please (and most respectfully), indulge me for just one moment.

With the current selection of available Doepfer modules, we've so far 
managed to make some pretty impressive and amazing noises.  Are we in 
fact looking for a more useful tool, or just another "instant 
gratification" device?  In other words, are we getting a bit anal 
here?

I mean, we're working with analog modular synthesis.  Not a digital 
model of analog synthesis, but instead, the real and raw building 
blocks of analog synthesis.  We've chosen the difficult (and most 
often the much more creative) path of sound generation.  We've made 
the choice.
 
Are we getting too focused on our own personal "wish list" to be 
objective?  

Are we willing to pay for Doepfer to fund the development of our own 
individual features?  

When will we be satisfied?

Just a few thoughts…

Kind regards,
Kevin Lamb


PS – Dieter's direct involvement with this group is VERY cool indeed, 
of which much more is welcome.  Not only does it give us (the user 
and purchaser) feedback to the company/CEO from which our hard-earned 
cash is spent and invested, I feel that our interests are directly 
served.  Besides, with Dieter listening, he can actually see that his 
efforts are appreciated, and certainly not wasted.