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

> 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

Dieter
Thanks very much for the info!
That might be slightly beyond my expertise but may try it as it would be quite useful. I 
might just buy another 154 for the second sequencer and then could use them 
independently OR mult the clock and resets together and use them together that way. 
Then one could be in pendulum mode, the other in one-shot mode etc. More options!
Best regards
Phil
--- In Doepfer_a100@yahoogroups.com, <hardware@...> wrote:

>
> > 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
>