Thanks DrBill and U Dave....nothing like advice from someone who has it or has used it....
UD; what did u mean by wasting time and cables going stereo ? Sequencing is about panning your instruments and effects to achieve good dispersion; keyboards like Korg Workstations, PA series etc have 4 outputs to channel effects properly and intelligent use of this does enhance the audio (otherwise why do they give u this facility ?). Also panning using sequencing software does get affected when u run mono...then there is the serial and parallel setups of the multi-effects that direct output to different channels.....

How many channels does the PAS accept (sterio, mono, XLR)

regards
michael.