Yes, I'm aware of this, what I actually want is to loop them and that needs specific control over the displayed frame number.
The line int
frame = pContext.getFrame() - 1 + sequence_start;
in the definition of
private String getCurrImageFilename(FlameTransformationContext pContext)
means that it automatically offsets by the current frame number. I could as a hack, make a wave that included the subtraction of the current frame to counter the effects of "pContext.getFrame()" inside the flame file, but that adds more places for me to do things wrong and would be a pain to adjust.