Basically the card and the accompanying software turned your computer into a giant out board processor. For a lot of users, however, the option of tying up the computer just for effect DSP wasn't practical. Wisely, Power Technology ported the software to the Direct X platform making the processors available via a standard soundcard and host DAW application. The product is now distributed by Event Electronics.
Event also handles the technical support making troubleshooting and upgrading a lot easier.
The latest version, 5.x has moved this solid bundle up a notch with the inclusion of new a brand new reverb and the addition of Aural Activator and Optimizer processors. These are significant additions. DSP-FX 5.x is a very complete package bundling together auto pan, chorus, delay, flange, pitch shift, tremolo, parametric eq, aural activator, and an end of chain level optimizer plug ins. The latest version also includes the brand new reverb plug in called the Studio Verb. The range of processors, coupled with the low CPU toll they take to work and the quality of the results makes for a very attractive package.