I installed Surge XT and Surge itself works great with the controller. But I still was unable to get any sound out of the Exquis software. Surge XT doesn’t show up in the plugin list and I could not find any setting where I could review or set up the VST plugin paths for the Exquis software.
Did you scan the plugins ? In the plugin list, when clicking on « Options… » > « Scan for… », you can add folders to scan with the « + » in the bottom left corner.