I 've noticed that the PAL DVDs of the Superman boxset have larger frame, with more bits in it. Moreover, their sound is in better quality. Of course, they have been sped up at the rate of 25 fps (vs. 23.973 of the original NTSC video) and the pitch of the sound is higher, but these problems can be corrected very easily.

Personally, I prefer the sound at Bosko video because it has more frequencies of the voices and more natural sound. It’s just in less db than WB and it has some noise that can be cleaned easily. At the WB’s version, the high frequencies must have been boosted, but the result is very sharp.

These days I 've started to edit these cartoons from the PAL DVDs, slowing them down (it’s just an option at a program) and adding the sound from Bosko. I 've restored their original openings, as you did at the mild-mannered version. In other words, I do almost what you have done, using the video from the PAL DVDs for their larger frame and the sound from Bosko. If anyone is interested in the result, let me know!

Except from your actions, in order to use as much of the image from the WB as possible, I 've managed to synchronize the opening of the Eleventh Hour from there to its original duration and I 've added the part “more powerful than a streak of lightening” etc from another cartoon, as it is the same.

You 've said that, at the “Showdown”, the part “more powerful than a streak of lightening” etc couldn’t be synchronized, as you have already said. It was the first cartoon using this exact introduction and I 've noticed that the lightening has a different animation: it’s stable and the effect is presented with variation at the intense of the brightening. At all the proceeding cartoons, the lightening changes its shape at each cel. The animation of the pounding surf and of the roaring hurricane is the same, but these sequences fade to each other at a different time.