[sdiy] (OT) Doepfer MIDI-CV oddity

[Justin Owen]

Justin Owen wrote:

>> I recently acquired a Doepfer A-190-1 MIDI-CV module which, initially I thought was faulty. It regularly drops/misses/ignores MIDI Note On/Off/Gate info - or at least fails to output it at the Gate Out.

>> Today, just as a test, I ran out of my normal M-Audio MIDI interface, into another MIDI-CV unit, out of the MIDI Thru of that and then into the A-190-1... which seemed to fix the problem. Odd.

-----Original Message-----
From: NSSINC [nssinc at hevanet.com]
Received: 19.01.2011 07:13:11

> Not that this will be any help, but I have the same problem with a home
made MIDI splitter driving an ESQ-1. Dropped notes etc. But if I patch
it after going thru another keyboard's thru, it works fine. And I don't
have any (intentional) ground connections in the splitter. Never looked
into it more after I found the quick "fix"...

-Al


Now that I've looked into this a bit more - I'm finding there's quite a few people that have this same problem with many different bits of kit - but this same THRU solution seems to work all round.

Harry B's Grounding theory and Tom W's resistor value theory both make sense to me - but loads of people have used this Doepfer module (and all the other types of MIDI-CV converters that people have had this same problem with) - and not experienced any troubles.

There's a couple of other modules from this same acquisition that are properly dead. I'm talking to Andy at Emis (UK Doepfer distributor) about a repair so I'll throw the A-190 in with them and see what he says - if there's any solution, I'll report back.

Thanks all - appreciated as always.

J