David,

I have sent you an email on April 18, 2006 (to you directly) with this
question and got no answer so far:

I have problems to understand what you mean with the extra triggers. Does
this mean that a trigger appears even if the corresponding switch is "off"
I could not understand this as the switch interrupts the trigger line in the
"off" state. Please specify when (at which position) the extra triggers
appear.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von deastman2
> Gesendet: Donnerstag, 20. April 2006 07:31
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 Re: A-154/dual A-155 combination false
> triggering problem
>
>
> Dieter,
>
> Just a gentle reminder ;) I'm still experiencing this problem...
>
> Thanks,
> David
>
>
> --- In Doepfer_a100@yahoogroups.com , "deastman2" <deastman2@...>
> wrote:
> >
> > Dieter,
> >
> > If the A-155's are configured for standalone operation, they work
> > correctly. Also, if I put the A-154 in manual mode and clock the
> > first A-155 with an LFO, there is no problem. But if I use an LFO
> as
> > an Ext. Clock source for the A-154, the problem appears, just like
> > using the internal clock.
> >
> > --- In Doepfer_a100@yahoogroups.com , "Dieter Doepfer" <hardware@>
> > wrote:
> > >
> > > David,
> > >
> > > before we continue: does this problem occur only with the
> > combination of
> > > A-155 with A-154 Or does it occur even with a standalone A-155.
> > If the
> > > A-155's have been modified earlier (for standalone mode) this
> > modification
> > > has to be cancelled (i.e. undo). Please refer to page 16 of the A-
> > 154 manual
> > > and the attached document.
> > >
> > > Best regards
> > > Dieter Doepfer
> > > Doepfer Musikelektronik GmbH
> > > Email address: hardware@
> > > Web Site: www.doepfer.com
> > >
> > >
> > >
> > > > -----Ursprüngliche Nachricht-----
> > > > Von: Doepfer_a100@yahoogroups.com
> > > > [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von deastman2
> > > > Gesendet: Donnerstag, 6. April 2006 09:54
> > > > An: Doepfer_a100@yahoogroups.com
> > > > Betreff: 1 A-154/dual A-155 combination false
> > triggering
> > > > problem
> > > >
> > > >
> > > > I have an A-154 configured to control two A-155's. I've
> noticed
> > that
> > > > for Trigger Rows 1&2 for both A-155's, some steps seem to
> generate
> > > > one or more extra, erroneous trigger pulses. I looked at the
> > output
> > > > on a scope, and I see the following:
> > > >
> > > > Steps 1 and 5 show the main trigger pulse, followed by three
> very
> > low-
> > > > level pulses at the spots where steps 2, 3, and 5 would be.
> > > >
> > > > Steps 3 and 7 show the main trigger pulse, followed by one very
> > low-
> > > > level pulse at the spot where steps 4 and 8 would be.
> > > >
> > > > Steps 2, 4, 6, and 8 function normally.
> > > >
> > > > These extra pulses are strong enough to at least partially
> > trigger an
> > > > envelope generator controlling a VCA with an osc feeding into
> it.
> > > > For example, with all steps/rows on both sequencers in the 'off'
> > > > position, except for row 1/step 1 on one seq, I get an envelope
> > > > trigger at step one, followed by a lower-level trigger at step
> 2
> > (and
> > > > in theory, it probably triggers again steps 3 and 5, if the
> > envelope
> > > > was set properly). These extra pulses stay in sync when I
> adjust
> > the
> > > > clock rate.
> > > >
> > > > I had this same problem when I first got the sequencers back in
> > > > January, except at that time, row 3 also had the same problem.
> > With
> > > > only one A-155 connected to the A-154, there is no problem.
> > Either A-
> > > > 155 will function properly with the A-154, but once they are
> > chained
> > > > together, the problem appears. I sent the A-154 back to
> Analogue
> > > > Haven for replacement, and the new one they sent me worked fine
> > for a
> > > > couple of months, until yesterday when this malfunction
> > resurfaced.
> > > >
> > > > Other relevant information: The connecting cables were replaced
> as
> > > > well. The sequencers are all powered by a single new PSU2.
> Aside
> > > > from the A-100, there is nothing else in close proximity which
> > could
> > > > be causing interference.
> > > >
> > > > I'm hoping there is a simple answer other than shipping back
> more
> > > > modules...
> > > >
> > > > Thanks,
> > > > David
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>