[sdiy] (OT) Doepfer MIDI-CV oddity

[Harry Bissell]

A hidden weenie I have found (that sounds like maybe the case here) is when a manufacturer does not follow the MIDI spec properly and
makes a ground connection via the MIDI cable. I had a device (not Doepfer) that would not play nicely, exactly like you report. Using another units
MIDI-THRU broke the errant connection and it worked fine. I eventually went inside the bad unit and cut the offensive pin away.

I use 5pin DIN cables for MIDI with all pins connected. Some people have reported that a proper MIDI cable has only two wires (for the LED connection) so maybe
a cable will set you straight as well...

H^) harry


----- Original Message -----
From: Thomas Strathmann <thomas at pdp7.org>
To: synth-diy at dropmix.xs4all.nl
Sent: Tue, 18 Jan 2011 11:30:16 -0500 (EST)
Subject: Re: [sdiy] (OT) Doepfer MIDI-CV oddity

On 1/18/11 17:21 , 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.
>
> I swapped leads round - same deal. Won't work direct but will work out of another units Thru. I've never had any problems with this MIDI rig so far, the main lead I use is only a few meters long and it works with everything else I throw at it.
>
> Clues?

If all else fails I'd capture the two MIDI streams using appropriate 
software and compare them side by side. Maybe you can see a difference 
between the two that gives you a better idea what goes on.

	Thomas
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-- 
Harry Bissell & Nora Abdullah 4eva