you'll use it under linux i suppose ? i doubt any morphos or linux driver will use capabilities of this card. It will sound the same as a simple SBLive.
I'm only using Pegasos for MorphOS, but I didn't install it yet, and I agree with Magnetic that Audigy will play much better than the simple SBLive in any ways.
Honestly I find that the mos on board sound is rather decent. Much better than most pcs. Especially now with the new 3d prefs. the only reason I have the Sb live is for MOL to offload sound from the cpu.
I get your point guys about the better output quality of the Audigy series over the sblive but will your ear really notice it ? I'm an eletronic music producer and i doubt you'd be able to notice a change by reading mp3 or movies which is what MorphOS allows about sound. The Pegasos isn't really an appropriate tool for home studio/recording stuff. And the current drivers won't allow you to use any of the Audigy interesting features. not worth the price of an audigy IMHO.