Well, just about all that PCI stuff is supported in Linux. Buy a $6 Ubuntu Studio Disk and it will dual boot your choice of OS.
For me, that's usually a regular sound card, but it also had the Echo Gina 3g working on install. The driver interface, in this case, is a user GUI that looks funky, but it is all there. The new box with just the PCI card install, was working on Linux install, also. I have two cards - one for the Gina 3G and one for the Layla 3G - same card. I think the Delta cards use the same hardware layout also - using the same Linux driver.