I had given up on getting my Dell Latitude  to work with Babyface. I assumed that it was an issue with not having separate usb buss controllers. I always had buffer errors. I found a link here to: http://www.thesycon.de/deu/latency_check.shtml This checking tester said that I had some devices that were causing problems. It said to disable them one at a time in device manager until the problem device showed up. There were two bluetooth drivers causing all the trouble. Now I can record in Samplitude at 512 with no errors. I have one smiling "Babyface". :-)