Doepfer

Hi all,

I've always been tempted to add a sequencer to my modular and have a few 
questions.  I'm not really interested in using it to sequence notes but I am 
very interested in the modulation possibilities it affords.  Aside from the 
obvious stuff,  I've seen it mentioned that it could be used as a graphic 
vco.  How would you do this?  As I understand it the sequencer advances one 
step for each incoming trigger it receives.  If you sent an audio rate 
signal, it would take eight cycles of that signal to replay the whole 
'waveshape' drawn by the knobs.  So there'd always be an eightfold frequency 
discrepancy between the incoming and outgoing signals.  Correct?  Or am I 
completely off the mark here?

I see that it is possible to use it as a multi-stage envelope via the a154, 
but is it possible to do this without an a154 using other modules?

Finally, there seem to be only two possibilities available in eurorack 
format: the a155 and the upcoming planb model21.  I realise that the planb 
model doesn't exist yet, but assuming that it did, what are the advantages 
of the a155 over the model21?  I've read through all the docs on both models 
but since I've never used a sequencer like this, I don't have a real sense 
of how significant the differences between them are in any practical sense.  
I only have room for one of these and because of where I live can't easily 
resell modules so I'd very much like to avoid making a mistake.  I suppose 
people will say that it depends on what I want to use it for, but the 
problem I have is that I don't know exactly what I'd use it for.  My natural 
inclination is to say that I'd mainly like to use it to sequence 
modulations, but I have this weird feeling that I might end using the 
trigger functionality a lot more than I intended...

thanks in advance,

rgds

Pierre

_________________________________________________________________
The Live Earth concert on the 7th July 2007, with more than 150 top 
musicians http://liveearthsos.msn.com/Hub.aspx?mkt=en-za

Hi Pierre, 
   
  I don't have either of those sequencers, but there are other alternatives; Analogue Systems do a quite nice sequencer, as do Analogue Solutions. Analogue Solutions do the Oberkorn which seems pretty highly spec'd, and they talk a bit about audio freq stuff on their site (and it's 16 steps), I have several of their small 8 step gate and CV seq's and these are great, cheap and fun if you will. I'd certainly check them out before deciding on any. The Doepfer one looks pretty cool and I intend to get one of them at some point, looks pretty good with the added controller.
   
  Just my tuppence worth!
   
  Charlie

Pierre Zeeman <pierrezee@hotmail.com> wrote:
          Hi all,

I've always been tempted to add a sequencer to my modular and have a few 
questions. I'm not really interested in using it to sequence notes but I am 
very interested in the modulation possibilities it affords. Aside from the 
obvious stuff, I've seen it mentioned that it could be used as a graphic 
vco. How would you do this? As I understand it the sequencer advances one 
step for each incoming trigger it receives. If you sent an audio rate 
signal, it would take eight cycles of that signal to replay the whole 
'waveshape' drawn by the knobs. So there'd always be an eightfold frequency 
discrepancy between the incoming and outgoing signals. Correct? Or am I 
completely off the mark here?

I see that it is possible to use it as a multi-stage envelope via the a154, 
but is it possible to do this without an a154 using other modules?

Finally, there seem to be only two possibilities available in eurorack 
format: the a155 and the upcoming planb model21. I realise that the planb 
model doesn't exist yet, but assuming that it did, what are the advantages 
of the a155 over the model21? I've read through all the docs on both models 
but since I've never used a sequencer like this, I don't have a real sense 
of how significant the differences between them are in any practical sense. 
I only have room for one of these and because of where I live can't easily 
resell modules so I'd very much like to avoid making a mistake. I suppose 
people will say that it depends on what I want to use it for, but the 
problem I have is that I don't know exactly what I'd use it for. My natural 
inclination is to say that I'd mainly like to use it to sequence 
modulations, but I have this weird feeling that I might end using the 
trigger functionality a lot more than I intended...

thanks in advance,

rgds

Pierre

__________________________________________________________
The Live Earth concert on the 7th July 2007, with more than 150 top 
musicians http://liveearthsos.msn.com/Hub.aspx?mkt=en-za



         

       
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[Non-text portions of this message have been removed]

Hi Pierre

If you sent an audio rate
> signal, it would take eight cycles of that signal to replay the whole 
> 'waveshape' drawn by the knobs.  So there'd always be an eightfold frequency 
> discrepancy between the incoming and outgoing signals.  Correct?  Or am I 
> completely off the mark here?
You are right. Usually you need a PLL to multiply the input frequency. 
Alternatively you could adjust (internally) one VCO module to run that high.

I have to admit, that I found the possibilities of graphic VCOs not that 
thrilling, as I expected. If you change the waveform while a note or 
melody most times 98% of the effect could be achieved by PWM or simple 
filtering.
If you want a module which does really astonishing waveform changes, 
than checkout the A-137. This is one of the brightest gems within the 
A-100 moduls.

> I see that it is possible to use it as a multi-stage envelope via the a154, 
> but is it possible to do this without an a154 using other modules?
If you connect the last trigger to the stop input and the "stop = reset" 
  function is enabled (internal jumper), it should be possible without 
the A-154.

Florian

Florian,

Bit disappointed that the graphic vco is not up to much.  Still,
totally agreed about the a137: it's one of my favourite modules.  

Charlie,

I was looking for something that would fit in my rack, but perhaps it
might be a better idea to get something like the oberkorn and save my
very precious g6 space for the future.  Hmmmm, choices.  You guys were
supposed to be limiting my options, not increasing them.

I think this is why I've always hesitated about the a155.  I suppose I
have some fundamental doubts about its utility to me...

but thanks anyway,

Pierre

pierre,

i was in the same not-sure-for-what situation, and decided to ease myself into analogue 
sequencing with a 160/161 combination, thus saving 1) loads of money and 2) loads of 
space. i was also more interested in control than notes.

limited, i know, but very much less so than i had imagined, necessity being the mother of 
invention.

my intention to buy something more spectacular once i'd gained a little more experience 
with the small stuff has now been put on ice - there is so much that you can do with the 
160/161 once you start plugging it into all those envelopes, slew filters and other stuff 
you've already got, that i plan to simply add another such combo to my very modest half 
empty suitcase.

which leaves me with enough cash and TEs to change my mind later :) or add a few other 
cheapo switches for more stuff that you never did with cubase.

cheers,

stu