Just to add a bit more information - my setup is as follows:
Access Virus B -> PC with USB to Midi Adapter
Novation Ultranova -> PC via Ultranova's USB port
Older Midi Keyboard -> PC with USB to midi Adapter
Presonus Studio One on the PC
If I configure a midi track in Studio One to take input from the older midi keyboard and send it to the virus OR lay down some midi notes in the piano roll editor and play them then I experience the extra high notes being played. It seems to be on key-off that something extra is happening on the Virus.
Interestingly, if I set up the midi track to take input from the Ultranova and output to the Virus then the problem doesn't manifest itself but when I lay down the midi notes on the the piano roll it comes back again.
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