Sorry, back again, there's one thing I need to check, just to be sure this isn't a software issue. If you uncheck 'Limit playback to 44kHz / 16 bit' does your GT 40 come back to life? I'm pretty sure it won't but I do need to check. Also please uncheck 'Use WASAPI for playback' so that we are testing the same conditions as the old VinylStudio (V8.3.1) would use. Thanks.