Doepfer

Hi John,

> I may be purchasing an old Korg SQ-10 sequencer which sends its 
> signal out in Hz and not 1v/Octave. Does anyone know of a patch so I 
> can convert this and seq my A-100 from the SQ-10?

If you have A-111's, in theory you should be able to stick the Hz/V CVs into the linear FM input on the A-111 - however, whether there would be problems adjusting the input pot to get the scaling correct I don't know ('Hz/V' is meaningless to me without saying *how many* Hz for each volt! I assume there must be set standards for this, but I've never seen it in print - if anyone knows what they are/where I can find 'em I'd love to know...).

For standard A-110's you'd need either to access the linear FM input on the board (and perhaps stick a pot on it too) or use a 'logarithmic converter' in front of the A-110 which will then negate the effects of the exponential converter inside the 110 (which gives the V/octave response). (Hence I think Joe's idea with the A-131 *is* round the wrong way, as he suspects!)

What you are thinking of trying to do is surely a pretty standard requirement, and thus someone must make a log converter for doing this, hopefully other list members may have come across one...? (I have a circuit diagram for making one in an old Bernie Hutchins article - I did try breadboarding it, but it was not entirely successful because I didn't have any matched transistors at the time.)

Tim

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Hi Tim

> If you have A-111's, in theory you should be able to stick the Hz/V CVs 
>into the linear FM input on the A-111 
Sorry, but this is not so easy :-( The linear FM input is dc-decoupled. So
any steady voltage (like a held note) will look like zero Volts.

You first have to deactivate the corresponding in the input circuit.

(The fix dc-decoupling is the biggest disadvantage of many A-100 modules -
I wish it was switchable).

Florian
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