[sdiy] Matrix FX BBD delay part update

[JH.]

> But still plenty of wiring tought!

More than I thought.
I wanted to avoid this: 
http://jhaible.heim.at/tonline_stuff/jh_synthi_inside1.jpg ,
but it gets much worse, this time.

> The matrix fronpanel, is that a schäääfer thing?
> is it silk screened by you? Maybee it is'nt silk screened at all?

Schaeffer, yes. Black anodized aluminium, graphics machined out, such that 
the
natural colour of aluminium shows.

JH.