Hi Josue

> You are wrong about the A111...The A111 uses a CEM 3340 but the module
> is not a raw CEM module, it have circuits around the sync inputs,
> comparators I think so it needs to see a rising or falling edge as all
> VCOs.
> You can check the Manual.

The schematic of the A111 shows the blank input for the Pin 9 of the
CEM3340 (only additions are a pull down resistor and a zener diode for
eleminating positive signals (schemo see page 1 of the service manual
and explanation page 7). So beside of the zenerdiode and the pulldown,
the Softsync input is designed as suggested in the datasheet.

The Datasheet says for this connection on page 6:
"[...]Finally, the oscillator may be soft synchronized by negative
pulses applied to the threshold voltage pin (pin 9 of 3340[...]). These
pulses cause the triangle upper peak to reverse direction prematurely,
causing the oscillation period to be an integral multiple of the pulse
periode. [...]"

So according to the Doepfer schematics, the Curtis datasheet and - as
minor argument - to my experience, a simple short pulse is perfect to be
used as soft syncs master signal. Of course a saw will do something
similar, but that shouldn't prevent you to try a pulse. ;-)


Florian