Ask for help about blending

Hello,

I'm working on a max project that will be shown in january in Valence, France, and need some help.

In my scene, I'm using several times the drawobject feature to capture gl-objects and apply them a blur.
So, each jit.gl.sketch draws a set of objects and is captured in a jit.gl.texture then passed out through a blur stuff.

Then this is rendered on a videoplane that I'm not able to blend on top of the regular scene, except if I set the depth_enable on 0. - but I need depth_enable 1 !!

I can understand that the @layer seems an alternative for my videoplane to be blended in the scene, but I am not able to blend more than one videoplane.

I can't understand why the plane have no transparency and how to manage several blurred objects to bring them back right in the gl-scene.
Hope this is not too confuse. Any help would be appreciated.