Lumagen are actually working on adding in video delay for Meridian users as the processing plus MRC means the voice is behind the picture with the Radiance. According to the HD621 manual it has up to 85ms of lipsync configurable per input which should be more than enough for modern VPs. The Radiance is adjusting gamut, greyscale (currently 11 point, 21 point is on the to-do list), gamma, black and white levels and is scaling and deinterlacing incoming images and still manages to finish before the G68.

Tim