the simplest example is stereo panning.
one channel opens with a positive voltage while the
opposite channel is closed by the same, but inverted
voltage.

or you maybe want to modulate a filter with
a negative envelope (i do this quite often).

best wishes

ingo



--- In Doepfer_a100@yahoogroups.com , "Anders Ehlin"
<anders_ehlin@h...> wrote:

> Yeah, well I haven't descided if I'll go for the 145 or 146! So,

while at it

> now, which events would I actually need a negative voltage for

Thanks!!

>
> Anders
>
>
> >From: "selfoscillate" <synaptic_music@y...>
> >Reply-To: Doepfer_a100@yahoogroups.com
> >To: Doepfer_a100@yahoogroups.com
> >Subject: 1 Re: random!!
> >Date: Wed, 25 Aug 2004 14:49:43 -0000
> >
> >
> >hello anders,
> >
> >you do not need negative values for this. just set
> >the filter cutoff to the desired minimum and open it
> >with a positive random voltage. makes no real difference
> >in the end.
> >
> >if you want to get a lfo for your system, the a145 has
> >selectable time range too, one cycle can take several
> >minutes.
> >
> >best wishes
> >
> >ingo
> >
> >
> >
> >--- In Doepfer_a100@yahoogroups.com , "Anders Ehlin"
> ><anders_ehlin@h...> wrote:
> > > Hmm... now here's a lot of options! Anyway, I want sounds to

evolve

> >in both
> > > directions, for example a filter to open and close again. What

I'm

> >after is
> > > something that, if we stick to the filter, at random times

opens or

> >closes
> > > (randomized) the filter with random amount... The 149-1 seems,

as

> >you said,
> > > very conrollable with its cv inputs! But do I actually need
> >negative voltage
> > > to close the filter, or just less amount of positive voltage.

Sorry

> >about
> > > these very basic questions, this is one of the things you really
> >don't have
> > > to make a big thing of when hazzling around with my nord

modular,

> >you pick a
> > > module, you pick another one and off you go! Not quite the real
> >thing ;-)
> > >
> > > Btw I missed on the 149-1 needs to be triggered, my mistake! But
> >I'll
> > > probably put in an LFO in my system anyway, and I have S&H out

from

> >my
> > > system 100 which should do the trick you were refering to Ingo,
> >though it
> > > might not be that slow come to think of it... ah merde, need to
> >read more!!
> > >
> > > Anders
> > >
> > >
> > > >From: Bakis Sirros <synth_freak_2000@y...>
> > > >Reply-To: Doepfer_a100@yahoogroups.com
> > > >To: Doepfer_a100@yahoogroups.com
> > > >Subject: Re: 1 Re: random!!
> > > >Date: Wed, 25 Aug 2004 06:22:18 -0700 (PDT)
> > > >
> > > >
> > > >or, you could add a negative offset voltage to the
> > > >a149-1 output via an a176 and an a138a,or an a176 and
> > > >a138c if you want an a149-1 AC output, or an a167
> > > >comparator, or, or, or...
> > > >bakis.
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >--- selfoscillate <synaptic_music@y...> wrote:
> > > >
> > > > >
> > > > > hello anders,
> > > > >
> > > > > the a149-1 generates a random event when you feed a
> > > > > gate signal
> > > > > into one of the gate inputs, so it is completely up
> > > > > to
> > > > > you, how often a random event will appear.
> > > > > the random part of the a118 changes permanently,
> > > > > so this is probably not what you want.
> > > > >
> > > > > if you want to smooth the transitions over a very
> > > > > long period,
> > > > > then you should consider the a170 dual slew limiter.
> > > > > it doesn't have vc of slew time, but it has a switch
> > > > > for
> > > > > the time base, just like the a140 adsr. with this
> > > > > you can
> > > > > get transitions which evolve over several minutes.
> > > > >
> > > > > i don't have information about the a117 here in the
> > > > > office,
> > > > > i have to try it in the studio to be able to say
> > > > > more about it.
> > > > >
> > > > > two additional notes:
> > > > > the a149-1 only gives you positive values.
> > > > > if you need them to be negative, then you need
> > > > > to add an a175 or a138c or a133.
> > > > >
> > > > > when i need such very slowly evolving random
> > > > > voltages,
> > > > > then i often use the combination lfo, slew limiter
> > > > > and
> > > > > sample&hold. every time when i need a new value i
> > > > > simply
> > > > > trigger the sample&hold. the actual lfo value is
> > > > > sampled
> > > > > and then slewed by an a170. this solution gives both
> > > > > positive and negative values.
> > > > >
> > > > > best wishes
> > > > >
> > > > > ingo
> > > > >
> > > > >
> > > > >
> > > > > --- In Doepfer_a100@yahoogroups.com , "Anders Ehlin"
> > > > > <anders_ehlin@h...> wrote:
> > > > > > Hello Ingo!
> > > > > >
> > > > > > Yeah the 149 seems to be the most versatile, I'll
> > > > > check how much
> > > > > space I
> > > > > > have left, haven't ordered yet.. :-) But do you
> > > > > know how low
> > > > > density on the
> > > > > > signals you can derive from it, If I want to get
> > > > > changes in the
> > > > > area between
> > > > > > 30 secs and 1 minute or so.. And how does the 117
> > > > > and 118 compare
> > > > > on this
> > > > > > I can't find any info on this in the manuals, more
> > > > > than that the
> > > > > slew
> > > > > > limiter can smoothen a signal with up to 10
> > > > > seconds.
> > > > > >
> > > > > > Thanks a lot!/Anders
> > > > > >
> > > > > >
> > > > > > >From: "selfoscillate" <synaptic_music@y...>
> > > > > > >Reply-To: Doepfer_a100@yahoogroups.com
> > > > > > >To: Doepfer_a100@yahoogroups.com
> > > > > > >Subject: 1 Re: random!!
> > > > > > >Date: Wed, 25 Aug 2004 11:07:08 -0000
> > > > > > >
> > > > > > >
> > > > > > >hello anders,
> > > > > > >
> > > > > > >the a117 digital noise module only outputs gate
> > > > > signals
> > > > > > >with the same level, so it is mainly for
> > > > > triggering
> > > > > > >other modules or for use as a noise source.
> > > > > > >
> > > > > > >the a118 gives smooth random voltages, but you
> > > > > can't control
> > > > > > >the randomness via cv. this is a good application
> > > > > for
> > > > > > >the a149-1, where randomness and the appearance
> > > > > of random
> > > > > > >events can be controlled with voltages and gates,
> > > > > but the
> > > > > > >voltage changes are not smooth, so you should add
> > > > > a
> > > > > > >slew limiter here. a vc slew limiter gives even
> > > > > more
> > > > > > >control over the smoothness of the random events.
> > > > > > >
> > > > > > >from my point of view the combination of a149-1
> > > > > and
> > > > > > >a171 is best, because it gives the most control.
> > > > > > >
> > > > > > >the a118 is an alternative, if you want to save
> > > > > money and
> > > > > > >rack space.
> > > > > > >
> > > > > > >best wishes
> > > > > > >
> > > > > > >ingo
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >--- In Doepfer_a100@yahoogroups.com , "Anders
> > > > > Ehlin"
> > > > > > ><anders_ehlin@h...> wrote:
> > > > > > > >
> > > > > > > > Hi guys!
> > > > > > > >
> > > > > > > > I can't descide what random module to go for,
> > > > > I aim at creating
> > > > > > >long
> > > > > > > > drones/soundscapes (mainly from incoming
> > > > > signals) that evolves
> > > > > very
> > > > > > >slowly
> > > > > > > > but "uncyclic", the random would for example
> > > > > triggering slow
> > > > > filter
> > > > > > >events.
> > > > > > > > I've looked at the 117 and 118 but the new
> > > > > contender 149-1 also
> > > > > > >seems nice.
> > > > > > > > Any suggestions Should I get a slew limiter
> > > > > to soften the edges
> > > > > > >even more
> > > > > > > >
> > > > > > > > Thanks Anders
> > > > > > > >
> > > > > > > >
> > > > >
> > >
>_________________________________________________________________
> > > > > > > > Auktioner: Tjäna en hacka på gamla prylar
> > > > > http://tradera.msn.se
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > >
>_________________________________________________________________
> > > > > > Chatt: Träffa nya nätkompisar på Habbo Hotel
> > > > > > http://habbohotel.msn.se/habbo/sv/channelizer
> > > > >
> > > > >
> > > >
> > > >
> > > >=====
> > > >Bakis Siros
> > > >Parallel Worlds / Polariton
> > > >Athens-Greece
> > > >[Doepfer_a100] group owner
> > > > http://www.shimarecords.co.uk
> > > > http://www.ward12.com
> > > >
> > > >
> > > >
> > > >
> > > >__________________________________
> > > >Do you Yahoo!
> > > >New and Improved Yahoo! Mail - 100MB free storage!
> > > > http://promotions.yahoo.com/new_mail
> > > >
> > > >
> > > >
> > > >
> > > >Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >

_________________________________________________________________

> > > Hitta rätt på nätet med MSN Sök http://search.msn.se/
> >
>
> _________________________________________________________________
> Auktioner: Tjäna en hacka på gamla prylar http://tradera.msn.se