[PD] pix_record mixed pixes

[vincent Rioux]

dear list,

I recently tried out pix_record object of Gem, running pd-39.2-extended 
for osx.
It worked pretty fine but i could not record anything else than a video 
connected to a unique gemhead.
i tried to mix several pixes (like moving rectangles with alpha layer) 
with the video using pix_mix but when recording the visual output i only 
get the video (without the applied 'transformations').
is that an expected behaviour?

best,
vincent