I just started having the same problem with the stand-alone version with Focusrite ASIO driver. It was working previously - last time used was a week or two ago. I downloaded the Asio4All driver and Windows reports PercX is using it, but no sound and setup doesn't show the driver. I am running version 1.2 of PercX.
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RE: "The Audio driver could not be opened" - ASIO Yamaha Steinberg USB Driver and Exit failure