Echoplex DP Overdub Problem

[Arthur Gatesy <amg@Cadence.COM>]

My echoplex digital pro seems to be stuck in overdub mode -
has anyone else seen this problem? The echoplex (about 3 months old) 
worked fine until a few days ago.

After recording a loop, everything else I play ends
up as an overdub (without hitting any buttons).  I've reset the 
parameters to the factory defaults and double-checked the 
OverdubMode parameter, but their settings seem OK.

I called Oberheim technical support this morning, and they 
recommended Wizard Electronics in Atlanta (I'm in northern CA).
Has anyone dealt with this place?

Thanks,

-Art Gatesy