Doepfer

> I've got two A-155's and one A-154 driving them both. About half
> the time I'd like to be able
> to run them independently, mostly to send #2 a slower divided
> clock to control longer-
> running musical modulations. Is there any way a switch could be
> added to #2 (or A-154) to
> be able to switch between syncing to the 154 and syncing to #2's
> own sync input jack?
> Doesn't have to be CV controllable or anything, just an easy way
> to use #2 by itself
> occasionally. Be nice if the whole panel could be gotten back
> (like the reset button, etc) but
> I'd settle for just a different sync input at this point.
>
> TIA
> Phil

If you want to run the second A-155 independently from the A-154 it needs a
separate control unit that generates the address signals. This is the job of
the small control board of the A-155. But you need a 4-fold switch as 4
signals (clock, A0, A1, A2) have to be switched between the internal control
board of the A-155 and the corresponding signals coming from the A-154. A
bit of electronical experience is required to realize that modification as
12 signals have to be wired to the right terminals of the 4-fold switch:

Clock to A-155 potentiometer/trigger boards (center terminal #1 of the
switch)
Address signal A0 to A-155 potentiometer/trigger boards (center terminal #2
of the switch)
Address signal A1 to A-155 potentiometer/trigger boards (center terminal #3
of the switch)
Address signal A2 to A-155 potentiometer/trigger boards (center terminal #4
of the switch)

Clock from A-154 (left terminal #1 of the switch)
Address signal A0 from A-154 (left terminal #2 of the switch)
Address signal A1 from A-154 (left terminal #3 of the switch)
Address signal A2 from A-154 (left terminal #4 of the switch)

Clock from A-155 control board (right terminal #1 of the switch)
Address signal A0 from A-155 control board (right terminal #2 of the switch)
Address signal A1 from A-155 control board (right terminal #3 of the switch)
Address signal A2 from A-155 control board (right terminal #4 of the switch)

All signals are available at the ribbon cables.

Best wishes
Dieter Doepfer