Definitely a different situation. I rarely use hardware synths for anything anymore, but I did use my Emu Proteus into C3 lately and produced a stuck note. It uses only a 5-pin midi cable…no usb connection when manufactured. This was happening only on the Hammond clones, Blue3 - B-3X - B5 - VB3 1,4. VB3 was the most active culprit. Other VSTs worked fine. My recent controllers are only USB, into laptop directly or in a powered hub. This happened in both situations, and only with Hammond clones.
The last time it happened, I was playing solo on “Green Eyed Lady”, and one note stuck, but I was able to keep the solo going with other notes, even though the stuck note kept droning until I hit panic button.
Since I moved to 3630, no problems yet (knock on wood). It was only sticking occasionally, so recreating it was impossible. My hub was working fine, and all cables were good. I was watching the C3 signal green lights responding to key press as the stuck note droned. I used the same controller for other VSTs after glitch, with no problems. My next guess was possibly laptop usb ports…maybe driver issues, or worn usb connections.
I know it could be related to cabling, hub, and controller. What I was saying earlier was… I found it strange that it happened on different controllers, different midi cabling (5-pin), only on Hammond VSTs, and directly into laptop (no hub).
The one thing I meant to try was running in stand alone, but my time is all consumed during this part of the year. I moved on with 3630 out of necessity, and will try the next C3 version with diagnostics when posted. It will be after the new year before I will have time to setup and experiment. Until then, I have no choice but rock on!