Doepfer

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