Hello Mike I don't own a DE, but this sounds like the CV from the interface is fed via a switching contact in the VCO-F socket to the VCO. If this switching contact is worn out, you won't have any longer a control from the MIDI-interface. If you dare to open the DE, then you might repari the socket like described in http://www.doepfer.de/faq/a100_faq.htm#contact%20problems Florian
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Re: [Doepfer_a100] problem with MIDI on Dark Energy I
2014-02-18 by Florian Anwander