[Jack-Devel] Focusrite Scarlett USB interfaces: 48000 preferred over 44100?

Hi all, I have several Focusrite Scarlett USB interfaces: - Solo - 2i2 - 2i4 They work out of the box but I noticed some flaw in either their firmware or ALSA or jackd: - with 48000 I can use much lower buffer sizes (down to 32) as with 44100 (at least 96) - with 44100 I have some slight clicks, about one per minute, sometimes less. Those clicks sound as if an electrical device (refrigerator, lights) was switched on. - with 48000 I have no such clicks. Has anyone made the same experiences? With Scarletts? With other USB-Interfaces? Is jackd or ALSA optimized for multiples of 48000 instead of 44100? Regards Holger