audio timing
audio timing is tested with a the restart attribute with the value always.
A click on the light blue button top left or its activation begin the audio
always, the magenta one ends it.
Because only the timing is tested, it is not important, whether
the used format OGG is interpreted or not; whether there is
noise or not. The timing is derived using the begin and end
of the audio as syncbases for the begin and end for a rotation
of a blue square. This rotation reference is compared with a
red rotation square behind with the same begin and end using
simple offset values. If something red gets visible, an error is
occured.
click or activate to begin audioclick or activate to end audio