on my grey 2600,
the gate out of the a-155 to the gate in on the 2600 works.
the trig out of the a-155 to gate does does not.
put any of the 3 trig outs of the a155 into the A-162 dual trig delay and it
works.
And this is via the gate in on the 2600, does not work on the trig in, at
least on my unit.
hope that helps.
best,
phil