Hi Zoran

> I thought that soft sync had to be driven with square wave, just like hard
> sync. Your comment is making me realize I made a pretty big mistake.

Neither you nor Josue are right. There are different ways to sync the
CEM3340. The A-111 requires a negative pulse in the softsync input.
A detailled description can be found in the datasheet of the CEM-3340.

Florian