> I just added to DIN sync IN and OUT to my Boss DR-110.
>
> On my scope the DR-110 CLock appears to be a perfect square wave, 0-5V.
>
> HOWEVER, when I use this as a master to run clocked modules
> (within my Doepfer system), everything seems off...

Maybe it's the clock spec of the DR-110 (I don't know this detail about the
DR-110). For example the midi or Sync clock is 96 beats per measure. One has
to divide this clock e.g. by 6 or 12 to obtain the usual 16 or 8 clocks per
measure. You can obtain such a division e.g. by connecting one of the A-161
outputs to the reset input of the A-160 (provided that you own an A-161) or
by an A-163 (modified for DC coupled in/outputs).

Best wishes
Dieter Doepfer