Doepfer

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: [Doepfer_a100] 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]
>