When I first installed GigaSampler I got pops and cuts when using large Gigasounds. I changed everything, tried every hint, but nothing helped. Yesterday I realizied, that my sblive and the usb interface used the same IRQ. My ISDN-Interfaced was plugin one USB port, so I deinstalled the drivers for that and deactivated the usb-hub. Now everything works fine. So just in case somebody has the same problem with pops in spite of excellent hardware, look up your IRQs.