Sound Module/Computer compatible with Alesis controller?

[Musical K]

Hi - any suggested solutions would be much appreciated.

I already have an Alesis Q88 controller (no internal sounds). I am looking for either a sound module or computer (PC or mac) to use with it and I need to achieve the following:

Good quality sound:

• Range of Strings (slow/legato/chamber/pizz/solo)
• Piano
• Organ (adjustable rotary effects)
• Sitar
• Brass
• Other keyboard sounds, (e.g. clav, rhodes etc)
• Touch sensitive

Ability to use Multiple Sounds (three/four if poss) at the same time (split, not layer)
Either by;

• (1) Splitting a full size keyboard into zones or (2) Using two or three smaller keyboards or (3) Any combination of these
• MUST be able to adjust different effects for EACH sound
• MUST be able to adjust 8ve for each sound
• MUST be able to program RANGE of zones