[sdiy] Matrix-12

[jhaible]

> It turns out it really is without the Aftertouch option, and has a
> preliminary manual that says I can get a retrofit at no charge in
> spring 1985. It also has a registration card to order the final manual.
> I suppose both vouchers are not valid anymore unfortunately. Again, I'd
> be willing to change the keyboard assembly myself if someone could tell
> me which type of keyboard works and what, if any, adaptations need to
> be done to connect it to the Matrix-12.

I'll answer even though I'm not sure if it is of much value - I'll give
you all I remember. (;->)

I have added an aftertouch function to an Ensoniq ESQ-1. This was
many years ago, but certainly long after 1985. The German distributor
for Ensoniq back then was also the distributor for Oberheim -
this *might* have been Waldorf (TSI ?), and they offered me
a Matrix-12 aftertouch sensor for free. Apparently they had a lot of
these left. In the end I used a Kawai sensor, and I'm sure I don't
have the Oberheim sensor anymore (not after moving houses).
But maybe the clue to Waldorf may help.


> Additionally, the mains transformer hums badly. Anyone knows if I can
> get a replacement power supply or what are the specs for it?

This hum is outright terrible. The main reason for me not to buy an
Xpander. May be ok at a 60Hz mains, but at 50Hz and increased
voltage (200V -> 230V  --- soon 240V ?) these transformers are
way under sized. Good luck finding one that fits - I guess the nice
display needs some extra windings with higher voltage than usual.
(Just a guess.)
You might try a step down transformer (like 230V -> 220V or
even lower), but then of course you're loosing "headroom"
for mains under voltage. (Or would that be "foot room"?)

JH.