Soundstorm was only on some (not all) Nforce2 motherboards (and maybe Nforce1 too, I'm not sure). Unfortunately Nvidia dropped it from their NF3 and NF4 chipsets, saying that apparently no one wanted to pay for the extra cost. I dunno, my NF2 Ultra board was pretty competitively priced at the time...😕
In any case, it's a great sound solution IMO, and definitely is better than about 90% of all other onboard audio solutions. It uses little CPU time for processing (it's done in hardware), supports EAX (up to 2.0, not the latest of course), and the feature that really set it apart from everything else - real-time Dolby Digital encoding. True not everyone needs it, but it was the ONLY way to encode DD in real time (for digital 5.1 sound in games and such) until about 3-4 months ago when the HDA X-Mystique and other C-Media 8768+ based cards appeared on the market.