Doepfer

--- In Doepfer_a100@y..., "Joe Buechler" <buechlerjoe@t...> wrote:
> Okay, I think the A154 as currently proposed doesn't do variable 
step 
> length and midi sync at the same time, I believe the clock input 
jack 
> shorts out the clock generator.

hi Joe, judging by the A190 manual, the A190 already has a divisor 
built in and it also reponds to Program Change n. the chart is also 
there at this url.

http://www.doepfer.de/a100_man/a190_man.htm

logically speaking, the A190 sends out a 50% PW duty cycle. the step 
time would be based on the divisor you set the A190 to be at. so the 
A154 would probably accept the duty cycle as is. now the Variable 
pulse shaper on the A154 would shape the A190 pulse cycle plus or 
minus from its 50% PW duty cycle. once it is shaped manually or by 
voltage control, the newly shaped pulse cycle, which is the same 
length as the A190 50% pulse duty but with a different pulse shape, 
would clock the A155's thru the buss connectors. 
> 
> Now I'm back to thinking about buying an A163 VC divider for to get 
> variable step length with midi sync. But ringmod's question got me 
> thinking. The A163 doesn't have a reset input like the A160 clock 
> divider does. Won't it end up in an indeterminate state when you 
reset 
> the master clock? 

you could avoid this problem by simply multing the clock output from 
the A190 so it goes to the A154 and the A163 , so that if you reset 
the A190 then the A154 and A163 would always be in sync(or phase). 
the A154 would accept the reset pulse from the A190 to do the stop 
and start functions and the A163 will always sync itself to the clock 
out of the A190 regardless of the A190 reset output.

now it would be a wise option to use a buffered multiple for multing 
the clock from A190 to clock the A154, A160/161 and the A163. i would 
use the Analogue Solutions MX224 Mixer / Inverter / Buffer, which is 
a 4hp module(small and has 2 inverted and 4 normal buffered outputs), 
to do the multing to have precise voltages to avoid any delays and 
keep things tight and in sync. the plus side to this module is, it 
has inverted outputs, as well, to do ping pong style panning and 
delays. hope this helps.

regards,
RM


That would mean the clock pulses from the A163 could 
> be as much as 180 degrees out of phase with the master clock, a 
> half-step delay.
> 
> Has anyone tried this? Is there any way to do what I want to do?
> 
> Joe