hello david,

i guess that you have those a155's which are modified,
so the modifications have to be removed.
have you checked your a155's for those additional
parts mentioned in the manual

best wishes

ingo



--- In Doepfer_a100@yahoogroups.com , "deastman2" <deastman2@...>
wrote:

>
> 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]
> > >
> >
>