Noel: The Trillium is still PDI, but it is 5 generation PDI. There are more features, more control over various parameters such as ambience, audio controls, complete MIDI and much, much more with Trillium. The samples are better in the Trillium series, you have the Smart Card that allows the storage of literally hundreds of settings from MIDI to capture. By the way, the Smart Card memorizes the voicing of the organ from which the settings were stored and will reconfigure in another Rodgers Trillium of same model. The organ reads off the card and reverts to its internal voicing when the card is removed. You'll find some orchestral voices, pipe modeling and other nice features available on the 5th generation PDI Trillium series that are absolutely fantastic. Good luck Best wishes, Keith Hutson Rodgers Consultant ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/web/.