Thanks for the quick reply. Please let me know if I can provide anything else.
Other than this little glitch I'm quite impressed with the synth. You did a great job on the UI.
Please keep in mind, that i'm not from Arturia. I'm a user.
To be sure to get in contact with Arturia support, you'll have to contact support through your account.
What seems to be happening is control message 73 is being sent by something.
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I also have a Kurzweil K2600 to use as a controller. After sending this, I'll unplug the A-800 and use the Kurzweil as the controller and see if the same thing happens. I'll let you know the results.
Yes based on your images it's a good idea to try another controller.
As you say, then somethings seems to send out data on midi CC73. Your issue is not something i can confirm happen by it self in Pigments. The issue does look like it's because some data somehow is send to Pigments from your equiptment. So the controller might be the culprit.
Midi-ox can help you to see, if your controller are sending out midi data:
http://www.midiox.com/I can suggest you try it.
It look like it's a kind of random behavior, so you have to test untill something happens, that you can identify.
Hope this helps to find out what's going on.
Best