The screen is divided in six parts. Left and right parts play the same image
The three horizontal parts play the same sequence but shifted in time : it gives the impression that the
"liquid" flood from the top to the bottom of the screen
A magnifying effect of the image
goes up and down in the upper part of the screen : it has been coded by
using write operation in STe video counters. The soundtrack routine uses
Timer A, so there is a big work of synchronisation between these both elements
(finaly it would have been simpler to use a VBL soundtrack routine, but
i had not developed it yet at this time)
One small scrolltext in the bottom of the screen
The soundtrack routine is played at 12.5khz oversampled at 25khz
