For those who wish to travel the software based arranger route for live performances should note that it will take considerable effort:
Setup Auto Accompaniment (Styles, Player, Sampler, Wavetable & Effects)
Setup Melody Voices (Sampler, Virtual Instruments & Effects)
Setup Vocal Harmonizer & Effects
Some of this can be considerable boring work (e.g., tweaking styles)....but the payback is excellent quality sound. Some believe this takes considerable expertise. If I can do it anybody can do it. When I was kid my parents were told by school officials and teachers that I was a moron as indicated by an IQ of 70 or so. They recommended to my parents that I should be institutionalized. The good news is with hard work I somehow survived. So if I can setup a software based system .... anybody can!!!
[This message has been edited by Frank L. Rosenthal (edited 07-20-2006).]