[sdiy] Synthi A breakout cable

[mdimmm at hotmail.com]

>> Hello everyone,
> 
> Hi!
> 
>> I'm looking for some technical advice for a simple DIY conversion.
>> I would like to make a breakout cable to connect my Synthi A to my Doepfer
>> A-100 system, and I'm not sure whether to use resistors in the cables or
>> not. Synthi modules connect to each other via 2.7kOhm resistors, and Doepfer
>> modules don't, they're simple patch cables. The breakout cable would connect
>> to the 32-way Prestopatch socket on the Synthi, with the possibility of 16
>> inputs and 16 outputs going into the Doepfer system.
>> To keep the signals on suitable level for both machines, should I put
>> resistors in the inputs, outputs, all 32 cables or use none at all?
> 
> There is a few things to recall. In the Synthi A you have 0.33V/Oct on the
> VCOs
> and 0.27V/Oct for the filter (if I recall things correctly), which may or may
> not be an issue for you. Simple voltage dividers will serve you well for the
> scaling.

As far as tuning is concerned, that's not really an issue. I use the Synthi
mostly for sound effects.

> 
> As for the resistors, they reside in the pins, and there exist different pins
> depending on the strength you want. Thus, the feeding of signals into the
> inputs is up for a suitable series-resistor. You may want to consider to have
> a few CV-mixers for some popular CVs (like frequency controls) so that you can
> mix a few signals together prior to tossing them down the line to the
> Synthi-A.
> 

Yeah, the resistors in the pins are to provide attenuation of the signals
before they get sent to the next module, so I think I'll put the same
resistors in the plugs connected to the inputs on the Prestopatch connector
to prevent the Synthi from being overloaded.

> I would consider buffering, just to keep things properly isolated. The Synthi
> A
> matrix is sensitive as it is.

What's buffering?

Cheers.
> 
> Cheers,
> Magnus
>