Excellent Bios update.
Without being mentioned anywhere in the release notes,
it has fixed an issue i was having with booting from an Intel 750 PCI-E SSD,
when the drive is set up to boot in EFI mode (UEFI with CSM Disabled).
It would throw a blue screen during the Windows boot-up, unless i manually started the drive from within the Bios menu using the "Boot Override" menu.
An issue i have found with this Bios update is that you cannot load saved USB profiles from older Bios versions (not even profiles from 1.18 will work),
as it will say it is not compatible with this Bios version (1.19).
Don't have an Asus Xonar, but i still have to set PCI-E Gen to 2 (or 1) in the Bios to be able to detect my sound card.
It's an easy setting to change as a workaround, but a lot of people may not know about this.