MP background for text typeset by \typefile

MP background for text typeset by \typefile

[context]

Hello,

is there a way to draw custom background (via MP) to a text typed by 
\typefile, which is so long so it spreads over more pages?

- I'm asking because I know how to typeset some text via \typefile with:

1. this:

\definetyping[Test]
   [before={\startbackground[background=color,backgroundcolor=blue]
           },
    after={\stopbackground
          },
   ]

- which creates a rectangular backround to the text, and the text may 
spread over pages;

2. or this:

\defineoverlay[AnOverlayDefinition][]

\definetyping[Test]
   [before={\startframedtext[background=AnOverlayDefinition,
                            ]%
           },
    after={\stopframedtext
          },
   ]

- which allows to define a custom background via overlay/MP, but which 
encloses the text to be typeset into a framed, and thus doesn't spread 
over pages.

My intention is to "decore" the text typed by \typefile with a "fuzzy" 
background, which uses overlay/MP.
But I am in the sitaution where I am able to figure out MP code just 
when the text is to be enclosed into \framed.

Is it possible to combine both cases? How?

Best regards,

Lukas
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