Doepfer

Hi Joe,

> Speaking of connectors in the back, if I were to install a DIN 
socket 
> in back of an A100 frame and wire the midi signal internally to the 
> A190 and A191, would simple wire work OK? Shielded two-conductor? 
Thin 
> coax?

The simple introductory book I have on MIDI says that screened twin 
core cable of audio quality is fine. BUT, MIDI is not 
straightforward. It works off a 'current loop', with opto-isolators 
used to ensure that interconnected bits of kit are electrically 
isolated from one another. The book strongly advises against trying 
to drive two inputs from a single output (you wouldn't be able to 
guarantee that either input would work properly) - this means that 
you would still have to run your A-191 from the 'thru' of the A-190 
(although conceivably you could connect them internally). Also the 
point of using screened cable is to prevent interference 
from 'escaping' from the lead, and not from noise penetrating it - 
the screen on a lead is attached to both pin 2's at either end, but 
the pin 2 on any socket is *not* connected to the chassis, in order 
to maintain the isolation of all bits of kit.

I'm not sure how helpful the above is - you were obviously expecting  
to connect things internally, only it might be less simple than you 
had imagined (?).

Tim