I finally got the audio delay (Rane AD22 made in 1994). When my TV is in game mode (with everything turned off) and I set the audio delay to 80ms, the image stops being annoying (as it turns out, there was input lag of about 80ms in game mode - not that noticeable unless I have a comparison at the press of a button). Also, I now can enable smooth motion on non-PC inputs, this makes the video look like 50fps instead of 25, like on a CRT. I could already do that on a PC with interlaced source files, but now I can watch a video tape or live TV from a STB with this. I have to increase the audio delay to ~200ms with this feature enabled.