It may be that the CVPal needs to be plugged in directly to the computer.
It lacks a dedicated USB controller chip, which it attempts to emulate using the tiny microcontroller IC, which also has to interpret incoming MIDI messages, drive the DAC etc.
The emulated USB controller uses a very slow communications protocol, which may not be handled correctly by the USB hub (it’s also problematic for some Windows machines, apparently).
Thanx for your reply! I tried 2 different hubs and 3 different usb cables.
Weird thing is that when the CvPal is plugged directly into the laptop in one port and a powered sound card in a second port, the CvPal stops transmitting and the sound card and cvPal both disconnects from the laptop…
I’ll try pluging the sound card with an usb to thunderbolt adapter and the cvPal directly in the usb port…
Thunderbolt 3 hadn’t been invented when the CVPal was designed, so it’s quite possible that some vaguary of the way the Thunderbolt 3 > USB adapter works means the CVPal doesn’t play well with other devices when connected that way.